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HVAC Online Directory

The links on this page will take you to HVAC components and information online.

General HVAC 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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General HVAC Terms & Definitions

HVAC imageHVAC BooksHVACR:Heating, Ventilation, Air Conditioning, Refrigeration
HVAC Air Filter 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 UnitsSEER:Seasonal Energy Efficiency Ratio. Energy rating for air conditioning and heat pump systems. The higher the SEER number, the greater the energy efficiency of the unit. There are too many justifications why any one household would want to purchase a lower SEER rated system compared to a higher SEER rated system or vise versa. To be direct, it is a personal decision based on two basic concepts: Lower SEER = Pay less now for the system and more on future energy bills or Higher SEER = Pay more for the system now and less on future energy bills. Talk with your estimator about price differentials and savings between ratings to determine what is best for your household.
HVAC Parts imageHVAC Replacement PartsReversing Valve:A heat pump component that changes the direction of refrigerant flow. By reversing the flow, the refrigerant cycle is changed from cooling to heating.
HVAC Software imageHVAC Software ProgramsManual J:A load calculation to determine residential heat loss or gain depending on the type of equipment being sized.
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 Manuals410a Refrigerant:A mixture of difluoromethane and pentafluoroethane which is used as a refrigerant in air conditioners and heat pumps as a replacement for ozone-depleting refrigerants like R-22. 410a is not a drop-in refrigerant and can only be used in 410a equipment.
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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