June 20, 2019 Uncategorized

Every homeowner should strive to create a comfortable, healthy living space. You don’t want your home to be a breeding ground for invisible, harmful, biological pollutants. These microorganisms cause you and your family to suffer from headaches, a runny nose, non-stop coughing, and scratchy eyes.

Running your HVAC system is one way to stay comfortable in the midst of extreme weather. However, it may not be enough in terms of effectively eliminating household contaminants.

Ultraviolet lights are an effective way to purify your indoor air and rid your home of pollutants like viruses, bacteria, and mold.

Marsh Heating and Air Conditioning is your leading HVAC company in Richfield MN that offers products designed to disinfect your home and keep your family safe from harmful microorganisms.

What is Ultraviolet (UV) Light?

Ultraviolet light is part of the light spectrum, ranging from 10 nanometers to 400 nanometers. The germicidal range of UV is within the 100-280 nanometer wavelengths, also known as UV-C. This range of UV light is absorbed by the DNA and RNA of microorganisms. This causes changes in the DNA and RNA structure, making the biological pollutants incapable of reproducing.

UV has been used for disinfection as early as the mid-20th century. It is used to treat drinking water, disinfect the air, and treat fruit and vegetable juices. In addition, UV lights are also used in many applications in the home.

UV Germicidal Lights for Home Disinfection

Ultraviolet (UV) germicidal lights produce short wavelength light (or radiation) that can break the genetic material in the nucleus of cells of microorganisms such as bacteria, viruses, and mold. With extended exposure, UV germicidal irradiation can also break down the particles that have deposited on an irradiated surface.

Germicidal lights are easily installed in your home’s HVAC system’s ductwork and their ultraviolet light rays eliminate surface and airborne particles. They can also be used to sterilize your air conditioner’s cooling coils and drain pans, which can significantly reduce mold and bacteria growth on surfaces that are often wet.

Research has shown up to 99% reduction of mold and bacteria on sanitized surfaces. The effectiveness of UV systems that irradiate microorganisms in circulating air can also be substantial but is less dramatic and depends highly on the microorganism type, air velocity, humidity, the size of the particles carrying the microorganisms, and the UV system design.


According to the National Toxicology Program, UV-C is classified as “reasonably anticipated to be human carcinogen”. Since UV-C creates radiation, it is not safe to be in the room while disinfection via UV-C is taking place.

Extended, direct exposure to UVC light can cause temporary skin redness and eye irritation. However, it does not cause skin cancer or cataracts. When properly installed by a qualified HVAC professional, you can be assured of safe operation and maintenance.


The use of UV germicidal lights is a non-chemical approach to disinfection and offers many benefits. Disinfection times are fast, which a typical disinfection cycle lasting about 15 minutes. With UV germicidal lights, you don’t have to add anything to sanitize your home, making it an inexpensive way to make sure your home is clean through and through.

Since UV germicidal lights can be easily installed inside your ductwork, they can work with nearly any heating and cooling system to improve the air throughout your entire home. Even when your comfort system isn’t running, germicidal lights can still work continuously.

In addition to eliminating surface viruses and bacteria, germicidal lights also kill germs, mold, and fungi that may live in ductwork and inside your heating and cooling equipment. This helps keep your HVAC system clean and running at peak efficiency.

The cost of running UV germicidal lights is very low, as units are powered by regular wall outlets. Because of their simplistic nature, these devices also require low maintenance and long lifespan. Typical UV bulbs last thousands of hours at their peak output, limiting the need for regular replacement and maintenance.

Call the Air Purification Experts

If you have questions about UV germicidal lights, call Marsh Heating and Air Conditioning. We will provide you with information in order for you to make a wise decision. For over 40 years, we have been your reliable Bloomington heating and air conditioning company.