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Heat transfer through solids
Heat transfer through liquids and gases
Heat transfer without solids, liquids, or gases
For health, moisture control
Measurement of thermal resistance
Measurement of ability to conduct heat
Amount of energy to raise one pound of water one degree
One SHU = 100,000 BTUs
One degree variation under 65°. Heating degree days are calculated over a period of time (typically a year) by adding up the differences between each day's mean daily temperature and the "balance point" temperature of 18°C (or 65°F), above which the building is assumed not to need any heating (the actual indoor temperature will be higher due to insulation retaining heat from the occupants). Thus three successive winter days with average temperatures of 4°C, −2°C and −4°C totals to 56 HDD.
One degree variation over 65°. Hot days, which may require the use of energy for cooling, are measured in cooling degree-days. On a day with a mean temperature of 80 degrees F, for example, 15 cooling degree-days would be recorded (80 – 65 base = 15 CDD).
National Fenestration Rating Council rates the efficiency of windows. The label has 4 factors listed: U-Factor, Solar Heat Gain Coefficient, Visible Transmittance, Air Leakage
A measurement of the efficiency of the water heater based on 64 gallons of hot water per day. The higher the EER number, the more efficient it is.
A measurement in percentage of a furnace’s heating efficiency.
A measurement of the efficiency of a consumer central air conditioning system
A measurement of both the efficiency of the compressor and the electric-resistance elements
