Heating, ventilating, and air-conditioning (HVAC) systems constitute one of the four factors that can affect the indoor air quality of a home or commercial building. If the HVAC systems are not able to control existing air contaminants and ensure thermal comfort (temperature and humidity conditions that are comfortable for most occupants) then indoor air quality complaints can occur.

Millard Heath provides many HVAC repair and maintenance services that can help improve the indoor air quality in your home or business. For more information about common problems, and health tips, please use the links to the right.

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General Rules To Help Control The Home Environment.

For more information on asthma, please visit the American Lung Association web site.

Controlling the home environment is a very important part of asthma and allergy care. Some general rules for home control for all members of the family are:

Select a unit with high-efficiency filters such as micro filter or HEPA media, good suction, and sealed construction. Ask for test data from manufacturers to determine the quantity and size of dust particles captured (e.g., 96 % at 1.0 micron or 99.97% at 0.3 micron).  Alternately, consider a central vacuum that exhausts particulate outside the home.

Anyone with asthma or allergies may want to avoid vacuuming.

Molds produce tiny spores to reproduce. Mold spores waft through the indoor and outdoor air continually. When mold spores land on a damp spot indoors, they may begin growing and digesting whatever they are growing on in order to survive. There are molds that can grow on wood, paper, carpet, and foods.  When excessive moisture or water accumulates indoors, mold growth will often occur, particularly if the moisture problem remains undiscovered or un-addressed. There is no practical way to eliminate all mold and mold spores in the indoor environment; the way to control indoor mold growth is to control moisture.

There are several important points to understand concerning mold detection in heating and cooling systems:

• Many sections of your heating and cooling system may not be accessible for a visible inspection, so ask the service provider to show you any mold they say exists.
  
• You should be aware that although a substance may look like mold, a positive determination of whether it is mold or not can be made only by an expert and may require laboratory analysis for final confirmation.  For about $50, some microbiology laboratories can tell you whether a sample sent to them on a clear strip of sticky household tape is mold or simply a substance that resembles it.
  
• If you have insulated air ducts and the insulation gets wet or moldy it cannot be effectively cleaned and should be removed and replaced.
  
• If the conditions causing the mold growth in the first place are not corrected, mold growth will recur.

The American Lung Association advises that following these tips could help reduce problems caused by polluted indoor and outdoor air:

• Stay aware of local weather reports for news of pollution blown in from fires nearby or other areas. Many communities offer forecasts for the next day's expected air pollution levels. Levels predicted to be orange, red or purple days signal unhealthy levels of ozone. However, pollution from fires may bring unhealthy levels of soot or fine particle pollution, which may be on days when ozone levels are not high.
  
• On days when air pollution from fires (or other sources) is predicted to be high, limit time spent outdoors and avoid exercise outside, especially if you have asthma, lung disease, or are a child or senior.
  
• Use a high efficiency furnace filter and replace it every two to three months. A high efficiency (MERV 10 or higher) filter not only protects the furnace and cooling coil, but can also capture up to 30 times more pollutants such as smoke, pet dander and pollen than standard fiberglass filters.
  
• So that air is always passing through the filter, run the furnace fan continuously regardless of the outdoor temperature. To do so, set the thermostat to the “on” position, rather than “auto”. There are several energy efficient systems that use variable speed furnace blowers to accomplish that also.
  
• Have a professional inspect the furnace once a year to make sure that the air intake is adequate and the unit is operating at peak efficiency. A smooth-running furnace helps the filter capture more soot particles in the home.
  
• Prohibit smoking in the home.
  
• Make sure gas cooking appliances are vented to the outdoors.

For more information, please visit the American Lung Association web site.

We service all of Denton County, including Lewisville, Flower Mound, Corinth, The Colony, Trophy Club, Little Elm, Sanger, Pilot Point, Mustang, Aubrey, Bolivar, Krum, Krugerville, Navo, Lincoln Park, Cross Roads, Stony, Ponder, Oak Point, Shady Shores, Argyle, Corral City, Justin, Dish, Northlake, Bartonville, Highland Village, Double Oak, Roanoke, Providence, Savannah and Hebron.

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