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AC Repair & Replacement in Fairfax VA

Air conditioning includes both the cooling and heating of air. It also cleans the air and controls moisture levels.

At Virginia Heating and Air we're dedicated to keeping homes comfortable. And during the hot summers in Fairfax and Manassas, VA everyone wants a perfectly working AC unit. If your air conditioner breaks down we can quickly come over for repairs or to perform a complete air conditioner replacement. Our service is second to none and we look forward to working with members of our community.

How Your Air Conditioner Works

An air conditioner cools a building by removing heat from inside and transferring it to another area. Then chemical refrigerants absorb undesired heat particles and pump them through a system of pipe to a coil which resides outside the building. The fan, also located in the outside unit, blows outside air over the hot coil, transferring heat from the refrigerant to the outdoor air. This is basically how your AC system works.

Basic Operations:

Most air conditioning systems have five mechanical components:
  • compressor
  • expansion valve or metering device
  • evaporator coil and blower
  • chemical refrigerant

Most central air conditioning units utilize a split system. That is, they consist of a "hot" side, or the condensing unit—including the condensing coil, the compressor and the fan—which is located outside your home, and a "cool" side that is situated inside your home or business. The cold side is made up of an expansion valve and a cold coil, and it is usually part of your furnace or some type of heating system. The furnace pushes air through the evaporator coil, which brings down the air's temperature. Then this cool air is distributed throughout your home by air ducts. A window unit operates on the same principal, the only difference being that both the hot side and the cold side are located within the same housing unit.

The compressor is the center of the system. Compressors are a type of pump, causing the refrigerant to flow through the AC unit. Its job is to attract low-pressure and cool refrigerant in a gaseous state and by compressing this gas, increase its pressure and temperature. This hot gas then makes its way to the condenser coil.

The condenser coil is made up of a series of pipes and a fan that sucks in outside air across the coil. As the refrigerant passes through the condenser coil and the cooler outside air travels across the coil, the air absorbs heat from the refrigerant which causes the refrigerant to condense from a gas to a liquid. The hot liquid then travels to the expansion valve.

The expansion valve is the control room of the system. By measuring the temperature of the evaporator, or coil, it lets liquid pass through a very small hole, which causes the refrigerant to expand to a low-temperature gas. This low-temperature refrigerant flows to the evaporator.

The evaporator coil is a series of piping connected to a furnace or air handler that blows indoor air across it, causing the coil to absorb heat from the air. The cooled air is then delivered to the house through a series of air ducts. The refrigerant then flows back to the compressor where the cycle begins again. Please give us a call if you have any questions regarding how your air conditioner works or if you conditioning requires repairs, maintenance, or a full replacement. We're here for Manassas and Fairfax, VA.