Standard Air-conditioning Standard central, wall, window, and portable ACs are not as energy efficient at cooling as modern heat pumps are, when the temperature outdoors is much higher than what you would like the indoor temperature to be. Because standard air conditioners are not as energy efficient as modern heat pumps and usually are powered by fossil fuel burning electricity, we classify them under the fossil fuel heating & cooling technologies. If it’s time to update your air-conditioning system (or even your heating system), or if you’d like to expand AC to other rooms in your house, consider getting a heat pump system which provides both cooling and heating with very little energy usage. Incentive Information High-efficiency heat pump incentives Contact Us Sarah Doherty Thermal Decarbonization Manager [email protected]