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| Heat trap
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Restriction of heat loss through water connections to a tank. |
| Heat treating
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Enhancement of a material by use of heating and cooling rates. |
| Heat welding
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Heating process, which can fuse plastic pipes and fittings together or to seal roofing membranes together. |
| Heater, baseboard
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Heating unit installed along the baseboard. |
| Heating cable
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Cable, often in a plaster ceiling, used to generate heat by use of electrical resistant, which occurs when an electrical current passes through a conductor with high resistance to the flow of current, which converts the electrical energy into heat. |
| Heating degree day
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The number of degrees per day that the daily average temperature (the mean of the maximum and minimum recorded temperatures) is below a base temperature, usually 65 degrees Fahrenheit, unless otherwise specified; used to determine indoor space heating requirements and heating system sizing. Total HDD is the cumulative total for the year/heating season. The higher the HDD for a location, the colder the daily average temperature(s). |
| Heating fuel units
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Standardized weights or volumes for heating fuels. |
| Heating fuels
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Any gaseous, liquid, or solid fuel used for indoor space heating. |
| Heating load
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The rate of heat flow required to maintain a specific indoor temperature; usually measured in BTU per hour. |
| Heating season
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The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating. |
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