A Calibrated Door Blower Test detects energy loss

Door Blower Test

The calibrated door blower test (air leakage test) allows an analysis of heat or cold air loss in a house. These leaks occur through doors, windows, vents or holes. Air leakage results in energy loss and higher energy costs. This test can detect even small leaks which could be costing quite a bit over time and make your HVAC systems work harder. A Door Blower Test measures ACH (Air changes per hour).


The testing equipment consists of an exhaust fan mechanism with a sealed doorway block. These are mounted usually at the front door and depressurizes the interior of the house. When this happens the now greater outside air pressure tries to seep in through any opening regardless of how small. A manometer is used to measure air pressure once negative air pressure is achieved. A technician then goes room to room throughout the house to locate these seepages.

Properly Sealing your home

Once the areas of seepage are identified then a plan can be enacted to properly seal the home. An attic is a very common place to lose heat. Often testing begins there before proceeding to the main floor and the rest of the home. Fixes may include filling holes, adding or replacing insulation and seals for doors and windows.

IECC Energy Code

The IECC (International Energy Conservation Code) is a measure of a building’s thermal envelope (air tightness). These codes are energy conservation specific and are required in some new building codes for new construction. These codes are required in order to meet energy conservation requirements. In order to comply with these codes this testing becomes necessary.

The Calibrated Door Blower (Air Leakage) test can benefit everyday homeowners when they are trying to reduce their energy costs. Reducing energy costs are very beneficial, but limiting air loss can also help your HVAC systems work less. Air Doctor Heating and Air can help you assess your home’s need to have the test.

Lowering Heating Costs in the Winter

Lowering your heating costs in the winter can save money and energy. Heating costs are always a big concern in the Winter and can get very expensive as temperatures drop. There are several things you can do to maximize your heat, heating system and save on these costs.

Here are some helpful tips to lower heating costs:

  • You can keep your furnace, heat pump, vents and filters clean, free of dirt, debris and clutter so air can circulate freely.
  • Change your air filters often so your system runs more efficiently and uses less energy.
  • Make sure the vents are cleaned, vacuumed regularly and that the coils are not collecting dirt which may cause them to work harder.
  • Use programmable thermostats so that the areas in your home that you are using at certain times of the day or night are kept at the correct temperature. Other areas are kept cooler and not using heat.
  • Only heat rooms which are in use. Close off vents, keep doors closed in extra rooms so the heat will not be wasted.
  • Allow the sun in! Open curtains on south facing windows to allow the sun’s natural heat to warm those rooms.
  • Make sure your home is properly insulated and sealed at the windows and doors. Invest in insulation and seals if necessary which will help keep the warm air inside.
  • Add humidity if your air is excessively dry. Heating systems can dry the air out, adding humidity can help you feel warmer at lower temperatures. Adding house plants can increase humidity naturally.
  • Use ceiling fans to increase circulation. Setting ceiling fans on low will circulate the air and heat. Using fans moving clockwise at low speed will help push heat downward into the room. In the Summer having the fans move counter clockwise will help pull the heat up and cool the room.

Air Doctor Heating and Air can help you if your Heating system is not running efficiently or wasting energy. Call us for an inspection if your suspect your system is not operating properly or if you are not lowering your heating costs.