| c001a | Most important (required) | Most important own/lease an electric vehicle or plug-in hybrid |
| c001b | 2nd most important (optional) | 2nd most important own/lease an electric vehicle or plug-in hybrid |
| c001c | 3rd most important (optional) | 3rd most important own/lease an electric vehicle or plug-in hybrid |
| c002a | Most important (required) | Most important own/lease a hybrid vehicle (non-plug-in) |
| c002b | 2nd most important (optional) | 2nd most important own/lease a hybrid vehicle (non-plug-in) |
| c002c | 3rd most important (optional) | 3rd most important own/lease a hybrid vehicle (non-plug-in) |
| c003 | When you bought your home, were solar panels already installed? | were solar panels already installed |
| c003_hp | When you bought your home, was heat pump heating/cooling already installed? | was heat pump heating/cooling already installed |
| c004 | Are you aware that the federal government offers a tax credit for installing solar panels? | ware that the federal government offers a tax credit for installing solar panels |
| c005 | As far as you remember, how big was the federal tax credit that was offered at the time when you installed solar panels? | how big was federal tax credit when installed solar panels |
| c006 | In which year did you install solar panels? | which year install solar panels |
| c007 | At the time of your solar panel installation, did your state or utility offer any incentives for installing solar panels? | at time of solar panel installation, did state or utility offer any incentives |
| c008a | Most important (required) | Most important install solar panels |
| c008b | 2nd most important (optional) | 2nd most important install solar panels |
| c008c | 3rd most important (optional) | 3rd most important install solar panels |
| c009 | If the federal government did not offer any tax credits for solar panels when I made the decision to install solar panels... | still install solar panels if no tax credits federal government |
| c010a | Most important (required) | Most important energy efficient appliances |
| c010b | 2nd most important (optional) | 2nd most important energy efficient appliances |
| c010c | 3rd most important (optional) | 3rd most important energy efficient appliances |
| c011a | Most important (required) | Most important heat pump heating and cooling |
| c011b | 2nd most important (optional) | 2nd most important heat pump heating and cooling |
| c011c | 3rd most important (optional) | 3rd most important heat pump heating and cooling |
| options_order | | order of options for importance |
| options_order_appliance | | order of options for importance appliance reasons |
| options_order_pump | | order of options for importance pump reasons |
| options_order_solar | | order of options for importance solar reasons |