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| Heat gain
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The amount of heat gained, measured in BTU's, from a space to be conditioned, at the local summer outdoor design temperature and a specified indoor design condition. An increase in the amount of heat contained in a space, resulting from direct solar radiation, heat flow through walls, windows, and other building surfaces, and the heat given off by people, lights, equipment, and other sources. |
| Heat gun
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Device, much like a hair dryer, which changes electricity to heat with a blower to aim that heat at a surface, to soften paint for removal or to accelerate drying. |
| Heat loss
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The amount of heat lost, measured in BTU's from a space to be conditioned, at the local winter outdoor design temperature and a specified indoor design condition. A decrease in the amount of heat contained in a space, resulting from heat flow through walls, windows, roof and other building surfaces and from exfiltration of warm air. |
| Heat of fusion
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Heat needed to melt a particular solid. For example, gold becomes liquid at about 2,000 degrees F and iron at 2,730 degrees F. |
| Heat of vaporization
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Heat needed to turn a liquid into a gas. |
| Heat pipe
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A device that transfers heat by the continuous evaporation and condensation of an internal fluid. |
| Heat pump
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Apparatus that can heat but also cool by changing its cycle and using a refrigerant, a compressor and heat exchanger. |
| Heat pump cooling mode
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In the cooling cycle of a Heat Pump , you are removing hot air from inside the house and sending it outside. You can feel the hot air outside, over the condenser fan motor. |
| Heat pump heating mode
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In the heating mode of a Heat Pump the refrigerant cycle is reversed and you are now removing the heat from the outside and sending it inside the house. You can feel the cool air outside, over the condenser fan motor. When temperatures go below 40 degrees Heat Pumps labor in producing heat and must use back up electric heat strips. Heat strips cost 3 times as much to operate as a Heat Pump when producing heat. |
| Heat pump water heaters
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A water heater that uses electricity to move heat from one place to another instead of generating heat directly. |
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