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general hvac direct-link index

HVAC air filters imageHVAC air filters linkhvac air filters
HVAC controls imageHVAC controls linkhvac controls
HVAC equipment imageHVAC equipment linkhvac equipment & systems
HVAC parts imageHVAC parts linkhvac replacement parts
HVAC software imageHVAC software linkhvac software & programs
HVAC supplies imageHVAC supplies linkhvac supplies & accessories
HVAC temperature zoning imageHVAC temperature zoning linkhvac temperature zoning
HVAC thermostats imageHVAC thermostats linkhvac thermostats

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Did you know? Boiler can be zoned to rooms, radiant heat in floors and water coils. is developed by advocates helping those who want to make a career in the HVACR industry.

hvac terms & definitions

HVACR imageHVACR bookshvacr:Heating, Ventilation, Air Conditioning, Refrigeration
HVAC air filters imageHVAC air filtershepa:(abbr. for High Efficiency Particulate Arrestance) Term for an air filter that must remove 99.97% of contaminant particles 0.3 microns or greater that pass through it. A HEPA filter is highly effective for trapping airborne dust, dirt, dust mites, dander, and other contaminates.
HVAC controls imageHVAC controlsblower relay:An electrical switch that powers the fan (blower). This is usually controlled by the thermostat, control board or fan/limit control.
HVAC electrical imageHVAC electrical guidesladder diagram:Schematic diagram showing the logical flow of electrical current. Most ladder diagrams for HVAC systems can be found on the access door of an indoor air handler or furnace and outdoor condensing unit.
hvac equipment imagehvac unitshspf rating:Heating Seasonal Performance Factor is an efficiency rating for a heat pump system. This can be a geothermal or air-source heat pump system. HSPF can be calculated by taking the total heat output in BTUs, dividing it by the total kilowatt hours of electricity it uses in an average season and rounding it down by one thousand. For example: If a heat pump puts out a total of 180,000,000 BTUs and it runs a total of 16,800 kWh per heating season, it would have a HSPF rating of 10.7 (180000000 / 16800 = 10741 / 1000). Currently, the U.S. Department of Energy's minimum efficiency standard for heat pumps is 8.2 HSPF.
hvac parts imagehvac replacement partscompressor:In HVAC terms, a compressor is an oil-filled, mechanical device that takes low-pressure, refrigerant vapor and compresses (condenses) it into a smaller volume which becomes a high pressure liquid. Most compressors are hermetically sealed which means its components are self-contained and are not accessible. Semi-hermetic compressors can be compared to vehicle motors and its internal components can be replaced or repaired. Semi-hermetic compressors are found in commercial and industrial applications requiring very large HVAC systems to condition an area.
hvac software imagehvac software programsmanual j:Type of manual or computerized calculation to determine residential heat loss or gain (load) depending on the type of HVAC equipment being sized for the enclosed and entire conditioned space. Many factors dictate a final load calculation including, but not limited to; R-values of insulation and building materials, windows, and doors.
hvac supplies imagehvac accessories condensate pump:A device used to pump condensation drained from the evaporator (indoor) coil to be disbursed elsewhere. Condensate pumps are usually found with systems that have no direct drainage.
hvac technical imagehvac technical manualsair change:The volume of air required to completely (100%) change the current volume of air in any enclosed area in a certain time frame. This can be calculated in minutes or hours depending on the size of the area. This calculation is used to measure air velocities and sizes for ducting, fans, fresh air intakes, air exchangers, and exhausts.
hvac zoning imagehvac temperature zoningvav systems:Variable air volume systems control the amount of air flow and temperature to the area it supplies. Unlike a single thermostat that controls a single system, VAVs have a separate temperature control for each zoned area.
hvac repair imagehvac troubleshooting guidesmultimeter:A tool used for measuring electrical voltage, ampere, resistance and continuity. Some meters include readings for temperature, microamps and capacitance.
hvac thermostat imagehvac thermostatsprogrammable thermostat:A thermostat that can be preset to cycle on or off at certain temperatures, times and days of the week. Tech Note: Make sure you obtain the proper programmable thermostat for the type of system or combination of systems you have. There is a difference between single,double (multi) staged and heat pump thermostats

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