Reference Resource
TECH Clean California and
Heat Pump Research
Welcome to the Heat Pump Research Index — a centralized resource designed to support evidence-based policymaking and program design. This carefully curated resource brings together cutting-edge studies, pilot project evaluations, market analyses, and technical assessments focused on heat pump technologies and the TECH Clean California Initiative.
Whether you’re crafting policies to accelerate adoption, assessing impacts on customer satisfaction, utility bills, and greenhouse gas emissions, or looking for best practices and lessons learned, the Index connects you to the TECH Clean California initiative and a broader landscape of heat pump research—delivering the insights needed to drive smart, scalable solutions for California’s clean energy future.
As you explore the page, you’ll find each report organized by topic. Clicking on a listed report will take you directly to the section or sections relevant to that topic. As new reports are finalized, they will be added to the index.
Opinion Dynamics is conducting Whole Independent Systems Evaluation™ (WISE), where we evaluate the initiative alongside, but independently of, the TECH Clean California implementer, Energy Solutions, and their team. This position allows us to deliver near real-time feedback to improve program operations and drive better outcomes. This approach creates effective feedback loops to help all parties better understand complex market adoption patterns, the effectiveness of program strategies, and opportunities for course correction.
INDEX
The following category links advance to the section links below. The category tab links connect directly to the corresponding report on our site and then to the specific data section.
Category Quick Links:
Awareness, contractors
Costs
Disadvantaged Workers
Finding a Contractor
Heat Pump Experience
HPWH Sizing
Interest in Electric Devices
Multifamily
Promotion of Heat Pumps
Satisfaction, TECH customer
TECH
Thermostat
Training
Awareness, customers
Demand Response
Equipment Issues, TECH customers
Heat Pump Benefits
Hiring Preferences
Incentives
Labor Market
Natural Gas – Equipment
Purchasing Factors
Single-family
TECH Participation, contractors
Thermostatic Mixing Valves
Water Heater Replacements
Barriers to Purchasing a Heat Pump
Disadvantaged Community
Financing
Heat Pump Drawbacks/Concerns
Homeowner Environmental Values
Installation Standards
Market Penetration
Panel Upgrades (Electrical)
Satisfaction, contractor
Sourcing, pricing, & profitability
TECH Participation, customers
Time-of-Use Rates
Awareness
Contractors
- Of energy efficiency and decarbonization programs
- Of heat pump incentives, non-TECH specific
- Of TECH Clean California
California Water Heating Market Study Section 4.6
(Data collected March 2023)
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.1
(Data collected Summer 2023)
TECH Interim Process Evaluation_Section 4.3.1
(Data collected Summer 2022)
Customers
Level of awareness
- Of HVAC heat pumps
- Of HPWHs
- Of financing for equipment replacement projects
- Of incentives for heat pumps
TECH Baseline Market Assessment_Section 3.2
(Data collected Spring 2022)
California Residential Fuel Substitution Workforce Readiness Section 4.1
(Data collected May 2024)
TECH Time 1 Market Assessment_Section 4.3
(Data collected Summer 2023)
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
TECH Baseline Market Assessment_Section 4.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.3
(Data collected Summer 2023)
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
California Residential Fuel Substitution Workforce Readiness Section 4.1.2
(Data collected May 2024)
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.3
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
Source of awareness
TECH Baseline Market Assessment_Section 3.2
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 4.3
(Data collected Spring 2022)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
Barriers to Purchasing a Heat Pump
TECH Baseline Market Assessment_Section 3.4
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.4
(Data collected Summer 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH Baseline Market Assessment_Section 4.4
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.4
(Data collected Summer 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.1.2
(Data collected May 2024)
Costs
HVAC
- Energy bills, TECH participants
- Existing equipment removal
- Equipment (unit)
- Installation, labor, and materials
- Total project
(see entry ‘TECH Participation, customers’)
TECH Baseline Market Assessment_Section 3.5
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 3.5
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 3.5
(Data collected Spring 2022)
General population
TECH Baseline Market Assessment_Section 3.5
(Data collected Spring 2022)
TECH participants
TECH Interim Process Evaluation_Section 4.3.4
(Data collected Summer 2022)
Water-heating
- Energy bills, TECH participants
- Existing equipment removal
- Equipment (unit)
- Installation, labor, and materials
- Total project
- Panel upgrades
(see entry ‘TECH Participation, customers’)
TECH Baseline Market Assessment_Section 4.5
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 4.5
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 4.5
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 4.5
(Data collected Spring 2022)
(see entry under ‘Panel Upgrades (Electrical Panel))
Demand Response
Contractor awareness
California Water Heating Market Study Section 4.6
(Data collected March 2023)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
Contractor enrollment of customers into Demand Response Programs
TECH Time 1 Market Assessment_Section 4.6.2
(Data collected Summer 2023)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
Disadvantaged Community
- Availability of Licensed Contractors in DAC
- TECH projects by DAC versus non-DAC
- Financing used for heat pump projects in DACs (GoGreen Home Loans financed by CAEATFA)
(see entry ‘Labor Market’)
TECH Interim Process Evaluation_Section 4.3.4
(Data collected Summer 2022)
TECH Baseline Market Assessment_Section 5.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.2
(Data collected Summer 2023)
Disadvantaged Workers
California Water Heating Market Study 4.1.4
(Data collected March 2023)
Equipment Issues, TECH customers
TECH Insights into Customer Experience and Satisfaction_Section 2.3.4
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.5
(Data collected Fall 2023)
Financing
- Used for heat pump project
- GoGreen Home Loans financed by CAEATFA
- Offered by contractors
- Customer awareness
General population homeowners
TECH Baseline Market Assessment_Section 5.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.2
(Data collected Summer 2023)
TECH customers
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Baseline Market Assessment_Section 5.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.2
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 6.2
(Data collected Summer 2023)
(see entry ‘Awareness, customer – Of financing for equipment replacement projects)
Finding a Contractor
TECH customers who found a TECH contractor
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
General population homeowners who found an HVAC contractor
TECH Time 1 Market Assessment_Section 4.4
(Data collected Summer 2023)
California Residential Fuel Substitution Workforce Readiness Section 1.2.2
(Data collected May 2024)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH customers who found a TECH contractor
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
General population homeowners who found an HVAC contractor
TECH Time 1 Market Assessment_Section 5.4
(Data collected Summer 2023)
Heat Pump Benefits, perceptions by general population homeowners
TECH Baseline Market Assessment_Section 3.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.3
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 4.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.3
(Data collected Summer 2023)
Heat Pump Drawbacks/Concerns, perceptions by general population homeowners
TECH Baseline Market Assessment_Section 3.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.3
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 4.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.3
(Data collected Summer 2023)
Heat Pump Experience, general population contractors
TECH Baseline Market Assessment_Section 3.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Sections 4.6.1
(Data collected Summer 2023)
California Water Heating Market Study Section 4.4
(Data collected March 2023)
TECH Baseline Market Assessment_Section 4.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
Hiring Preferences, attractiveness of heat pump experience when hiring by contractors
TECH Baseline Market Assessment_Section 3.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.6.2
(Data collected Summer 2023)
California Water Heating Market Study Section 4.1.3
(Data collected March 2023)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
Homeowner Environmental Values
TECH Baseline Market Assessment_Section 2.2.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 3.3.1
(Data collected Summer 2023)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Insights into Customer Experience and Satisfaction_Section 2.1
(Data collected Summer 2023)
HPWH Sizing
- Contractors discuss upsizing the tank with customers
- Gallon capacity changes from original to replacement
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
(see entry ‘TECH, General’)
Incentives
- Influence on contractor heat pump sales
- Influence on customer purchase of heat pump
- Number of heat pump incentive programs in California
- TECH single-family incentives
- TECH Multifamily incentives
- TECH incentive applications
- SGIP requirements
TECH Interim Process Evaluation_Section 4.3.5
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
HVAC heat pumps
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.5
(Data collected Summer 2023)
TECH Time 1 Market Assessment_Section 6.1
(Data collected Summer 2023)
HPWH
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.5
(Data collected Summer 2023)
TECH Time 1 Market Assessment_Section 6.1
(Data collected Summer 2023)
TECH Interim Process Evaluation_Section 3.5
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 3.5
(Data collected Summer 2022)
(see entry ‘TECH Participation, contractors’)
TECH Reduced Incentive Applications in 2023 Memo
(Data collected Winter 2023)
Installation Standards
California Water Heating Market Study Section 4.2
(Data collected March 2023)
California Water Heating Market Study Section 4.3
(Data collected March 2023)
Interest in Electric Devices
TECH Time 1 Market Assessment_Section 3.3.1
(Data collected Summer 2023)
Labor Market
- Availability of contractors licensed to install heat pumps
- COVID-19 pandemic employment and contractor analysis
- HPWH experience
- HVAC heat pump experience
- Geographic distribution of contractors licensed to install heat pumps
- TECH-enrolled contractors' licenses
- Workforce projections
- Workforce supporters and enablers
HVAC
TECH Baseline Market Assessment_Section 3.6.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.6.1
(Data collected Summer 2023)
HPWH
TECH Baseline Market Assessment_Section 4.6.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.1
(Data collected Summer 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.2.3
(Data collected May 2024)
(see entry ‘Heat Pump Experience, contractors’)
(see entry ‘Heat Pump Experience, contractors’)
California Residential Fuel Substitution Workforce Readiness Section 4.2.1
(Data collected May 2024)
California Residential Fuel Substitution Workforce Readiness Section 4.2.2
(Data collected May 2024)
TECH Interim Process Evaluation_Section 4.1
(Data collected Summer 2022)
California Residential Fuel Substitution Workforce Readiness Section 4.2.8
(Data collected May 2024)
California Residential Fuel Substitution Workforce Readiness Section 4.2.5
(Data collected May 2024)
Market Penetration
TECH Baseline Market Assessment_Section 3.1
(Data collected Spring 2022)
TECH Baseline Market Assessment_Section 3.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.1
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 4.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.1
(Data collected Summer 2023)
Motivators for Heat Pump Purchase
(see entry ‘Purchasing Factors’)
Multifamily
HVAC heat pumps
TECH Baseline Market Assessment_Section 3.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.6.2
(Data collected Summer 2023)
HPWHs
TECH Baseline Market Assessment_Section 4.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
(see entry ‘Incentives, TECH multifamily incentives’)
Natural Gas – Preferences for equipment, customers
TECH Baseline Market Assessment_Section 2.2.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 3.3.1
(Data collected Summer 2023)
Panel Upgrades (Electrical Panel)
- General population contractors encountering need for panel upgrade for a HPWH
- General population homeowners encountering need for panel upgrades for a HPWH
- General population homeowners encountering needs for panel upgrades for HVAC
- TECH participants who got panel upgrades as part of the heat pump project
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.1.2(Data collected May 2024)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
Promotion of Heat Pumps, contractors
California Water Heating Market Study Section 4.4.2
(Data collected March 2023)
TECH Baseline Market Assessment_Section 5.1
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 7
(Data collected Summer 2023)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
Purchasing Factors
- General
- Barriers
- Ductless HVAC specific
- Reasons TECH participants initiated their heat pump project
- Reasons TECH participants purchased heat pump
- Reasons general population homeowners initiate their heat pump project
- Solar PV presence, TECH customers
- Solar PV presence, general population homeowners
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
(see entry ‘Barriers to Purchasing a Heat Pump’)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3
(Data collected Fall 2023)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Insights into Customer Experience and Satisfaction_Section 2.1
(Data collected Fall 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.1
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.1
(Data collected Fall 2023)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
Satisfaction
Contractor
TECH Interim Process Evaluation_Section 4.2
(Data collected Summer 2022)
TECH Reduced Incentive Applications in 2023 Memo
(Data collected Winter 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.4
(Data collected Fall 2023)
TECH customer
TECH Single-Family Customer Post-Install Survey Topline Findings
(Data collected Winter 2022)
TECH Interim Process Evaluation_Section 4.3.4 – Single-Family Customer Satisfaction
(Data collected Summer 2022)
HVAC heat pumps
TECH Insights into Customer Experience and Satisfaction_Section 2.3.6
(Data collected Fall 2023)
Heating & cooling effectiveness
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3
(Data collected Fall 2023)
HPWH
TECH Insights into Customer Experience and Satisfaction_Section 2.2.7
(Data collected Fall 2023)
HVAC heat pumps
TECH Insights into Customer Experience and Satisfaction_Section 2.3.6
(Data collected Fall 2023)
HPWH
TECH Insights into Customer Experience and Satisfaction_Section 2.2.7
(Data collected Fall 2023)
Single-family
HVAC heat pumps
TECH Baseline Market Assessment_Section 3.6.2
(Data collected Spring 2022)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH Time 1 Market Assessment_Section 4.6.2
(Data collected Summer 2023)
HPWH
TECH Baseline Market Assessment_Section 4.6.2
(Data collected Spring 2022)
California Residential Fuel Substitution Workforce Readiness Section 4.1.1
(Data collected May 2024)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
(see entry ‘Incentives, TECH single-family incentives’)
Sourcing, pricing, and profitability of water heaters for contractors
California Water Heating Market Study Section 4.1.2
(Data collected March 2023)
TECH
General
TECH Interim Process Evaluation_Section 3.1
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 3.2
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 3.5
(Data collected Summer 2022)
Eligibility
- Perceived clarity of customer eligibility, contractors
- Perceived clarity of equipment eligibility, contractors
- Perceived availability of eligible equipment, contractors
TECH Interim Process Evaluation_Section 4.3.2
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.2
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.2
(Data collected Summer 2022)
TECH projects
- Costs
- Water-heater storage capacity differences (gallons) between original and HPWH
- HPWH operating modes set by contractor
- Permitting and post-install inspections
TECH Interim Process Evaluation_Section 4.3.4
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.4
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.4 – Single-Family Customer Satisfaction
(Data collected Summer 2022)
Satisfaction with TECH
Contractor (see entry ‘Satisfaction, contractor’)
Customer (see entry ‘Satisfaction, TECH customer’)
TECH Participation
Contractors
- TECH-enrolled contractor, firmographics
- Enrollment process
- TECH staff communication
- Project challenges encountered
- Incentive applications
- Reasons for decrease in 2023
- Satisfaction with TECH
TECH Interim Process Evaluation_Section 4.1
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.1
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.1
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.4 – Project Challenges
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.3.5
(Data collected Summer 2022)
TECH Incentive Applications in 2023 Memo_pg. 4-7
(Data collected Winter 2023)
(see entry ‘Satisfaction, contractors’)
Customer
General
- Finding a TECH-enrolled contractor
- Reasons for initiating heat pump project
- Equipment issues
- Satisfaction with TECH
TECH Interim Process Evaluation_Section 4.3.3
(Data collected Summer 2022)
(see entry ‘Purchasing Factors’)
(see entry ‘Equipment Issues, TECH participants‘)
(see entry ‘Satisfaction, TECH participants’)
HPWH
- Energy bills – perception of change in bills after getting HPWH
- Hot water availability
- Installed location
- Operating mode and reasons for adjusting
- Owner/renter status
TECH Insights into Customer Experience and Satisfaction_Section 2.2.6
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.5
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.3
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.4
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.2.1
(Data collected Fall 2023)
HVAC Heat Pumps
- Owner versus renter status
- Perceived change in monthly energy bills
- Presence or absence of air conditioning before heat pump
- Use of heat pump for heating and cooling
TECH Insights into Customer Experience and Satisfaction_Section 2.3.1
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.5
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3
(Data collected Fall 2023)
Thermostat
- How many TECH HVAC heat pump customers get a new thermostat
- Usage compared to prior system (frequency of adjustment and difficulty of using)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3 – Thermostat
(Data collected Fall 2023)
TECH Insights into Customer Experience and Satisfaction_Section 2.3.3 – Thermostat
(Data collected Fall 2023)
Thermostatic Mixing Valves
TECH Baseline Market Assessment_Section 4.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
California Water Heating Market Study Section 4.5
(Data collected March 2023)
TECH Interim Process Evaluation_Section 4.3.4
(Data collected Summer 2022)
Time-Of-Use Rates
TECH Baseline Market Assessment_Section 3.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.6.2
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 4.6.2
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.2
(Data collected Summer 2023)
Training
General
- TECH training influence on career
- TECH training impact on day-to-day work approach
- Company training policies
- Desired training topics
- HPWH training landscape analysis
- Training motivations, preferences, and experiences
- Training outreach and identification
- Training providers
TECH Contractor Six-month Post-Training Findings_Section 1.2
(Data collected Fall 2022)
TECH Contractor Six-month Post-Training Findings_Section 1.6
(Data collected Fall 2022)
California Water Heating Market Study Section 4.5.3
(Data collected March 2023)
California Water Heating Market Study Section 4.5.4
(Data collected March 2023)
California Water Heating Market Study Section 4.5.7
(Data collected March 2023)
California Water Heating Market Study Section 4.5.5
(Data collected March 2023)
California Water Heating Market Study Section 4.5.1
(Data collected March 2023)
California Water Heating Market Study Section 4.5.2
(Data collected March 2023)
Contractors and TECH trainings
- Contractor awareness of TECH trainings
- Contractor attendance of TECH trainings
- Contractor application of learnings from TECH trainings
- Contractor likelihood to recommend TECH-sponsored trainings
- Contractor Satisfaction
TECH Interim Process Evaluation_Section 4.5
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.5
(Data collected Summer 2022)
TECH Contractor Six-month Post-Training Findings_Section 1.3
(Data collected Fall 2022)
TECH Interim Process Evaluation_Section 4.5
(Data collected Summer 2022)
TECH Interim Process Evaluation_Section 4.5
(Data collected Summer 2022)
Heat pump training source and method, used and preferred, non-TECH specific
TECH Baseline Market Assessment_Section 3.6.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 4.6.3
(Data collected Summer 2023)
TECH Baseline Market Assessment_Section 4.6.3
(Data collected Spring 2022)
TECH Time 1 Market Assessment_Section 5.6.3
(Data collected Summer 2023)
Water Heater Replacements
California Water Heating Market Study Section 4.3.3
(Data collected March 2023)
List of Sources
This index covers research findings from TECH Clean California evaluations conducted by Opinion Dynamics. Our team has hyperlinked evaluation reports containing findings from each topic area and specified the document section where the results can be found. We conducted the studies between 2021 and 2024, and the findings reflect the experience of customers or contractors at the time of data collection. These studies are listed below in order of their data collection timeframe, from oldest to most recent. Click on image to view PDF.
Baseline Market Assessment Report
Data Collection Timeframe: Spring 2022
Published: July 2022
Time I Market Assessment Report
Data Collection Timeframe: Summer 2023
Published: May 2024
TECH Post-Training Level 3 Behavior Survey Findings
Data Collection Timeframe: Fall 2022 (Sept–Nov)
Published: February 2023
Single-Family Customer Post-Install Survey Topline Findings
Data Collection Timeframe: Winter 2022 (Nov–Dec)
Published: September 2023
Interim Process Evaluation Report
Data Collection Timeframe: Summer 2022
Published: November 2022
Insights into Customer Experience and Satisfaction Report
Data Collection Timeframe: Fall 2023
Published: February 2024
Reduced Incentive Applications in 2023 Memo
Data Collection Timeframe: Winter 2023 (Nov–Dec)
Published: May 2024
Residential Building Decarbonization and Technology Brief
Data Collection Timeframe: Fall 2021
Published: January 2022
TECH Clean California Engineering
Desk Reviews
Data Collection Timeframe: Fall 2023
Published: June 2024
CA Residential Fuel Substitution Workforce Readiness Study
Data Collection Timeframe: May 2024
Published: Sept 2024
CA Heat Pump Residential Market Characterization and Baseline Study:
Data Collection Timeframe: Fall 2020
Published: May 2022
TECH Cohort Training: In-Depth Interview Findings
Data Collection Timeframe: Nov 2022
Published: March 2023
TECH Clean California: Insights into Customer Experience and Satisfaction
Wave 2
Data Collection Timeframe: Fall 2024
Published: March 2025
California Water Heating Market Study
Data Collection Timeframe: March 2023
Published: March 2024
TECH CLEAN CALIFORNIA:
INCREMENTAL COST STUDY
Final Phase I Findings
Data Collection Timeframe: Dec 2023
Published: February 2024
TECH CLEAN California Pilots and Quick Start Grant Evaluation
Data Collection Timeframe:
Published: June 2025
TECH Population-Based Pathway Impact Report
Data Collection Timeframe:
Published: November 27, 2024
TECH Clean California
Gas Baseline Incremental Cost Study
Data Collection Timeframe:
Published: September 25, 2025
Process Evaluation of the TECH Clean California Initiative
Data Collection Timeframe: Summer 2024
Published: March 2025
TECH Clean California: Time 2 Market Assessment Final Report
Data Collection Timeframe: Fall 2024
Published: May 2025
Talk with the experts
Ellen Steiner, PhD
ESteiner@opiniondynamics.com
Jen Loomis, PhD
JLoomis@opiniondynamics.com
Jayden Wilson
jwilson@opiniondynamics.com
Danielle Fulmer
dfulmer@opiniondynamics.com
Learn More at
TECH Clean California
