MN Heating And Cooling Systems Minneapolis MN

Indoor air quality is important. We breathe about 5,000 gallons of air daily. Indoor air can be more polluted than outdoor air, even in large industrialized cities. We spend 90% of our time indoors. Especially at risk are infants and the elderly, who spend almost all of their time indoors. Indoor pollution can be as serious as carbon monoxide poisoning, which can be life threatening. Excessive moisture inside the home can also contribute to indoor air contamination.

Keep Your Home Healthy

Reduce your exposure to indoor pollutants

It’s best to focus on changes you can take to reduce your exposure to indoor pollutants.

Heat Recovery Ventilation

Ventilation can be provided by natural airflow through doors and windows. A heat exchanger (heat or energy recovery ventilator) is an efficient and economical way to have air exchanged and yet reduce heating and cooling costs. Heat exchangers require maintenance to be efficient and effective.

Optimum Relative Humidity

Moisture levels need to be monitored. Too much moisture can cause damage to a home and affect health. Molds and viruses multiply with too much moisture in the home.

At low relative humidity, incidents of respiratory infections and allergic rhinitis increase. Other concerns of low humidity are static electricity, damage to furniture and musical instruments, and dry skin.

Controlling Excess Moisture

  • Use exhaust fans when showering
  • Repair plumbing leaks
  • Vent clothes dryer
  • Dry and clean flooded materials

People produce 3 pints of water per day just breathing. Other sources of moisture include cooking, cleaning and taking showers. About one pint of moisture comes from a 10-minute shower. Moisture coming from basement walls and floors can be up to 100 pints per day with wet soil.

Removing Moisture

  • Ventilate in cold weather
  • Dehumidify or air condition in warm weather

Relative humidity is the amount of moisture in the air relative to the amount it can hold. Cold air can hold very little moisture, so even at 90% RH there is little moisture in the air. As the air is warmed, the amount of moisture it can hold increases and the RH decreases. Air at 0°F and 90% RH will have a RH of only 5% when warmed to 70°F. Since outside air is very dry during the winter, ventilating is the best way to remove moisture.

Summer ventilation may increase the humidity in a basement. Cooling air increases its relative humidity. Air at 75°F and 65% RH will have a relative humidity of about 90% if cooled to 65°F in a cool basement. A dehumidifier or air conditioner is recommended to reduce basement humidity during the summer.

Reduce Condensation

  • Winter — 30-40% humidity
  • Summer –less than 65-70% humidity

Even with energy efficient windows, relative humidity in the home or in one room can cause condensation on windows. Prolonged moisture from condensation can damage the window by rotting wood around the window and lead to mold growth. Reduce condensation by keeping the indoor humidity level below 40% in winter. You can reduce window condensation by adding an additional layer, such as plastic, which warms the window surface. This is similar to dressing in layers.

Dehumidifiers generally only lower humidity to about 50% so dehumidifiers are not adequate for limiting condensation during the winter.


Hygrometers measure relative humidity but are often not accurate. Some can be as much as 20% off. Electronic digital units tend to be more accurate. To calibrate, place the hygrometer in a sealed plastic bag with a mixture of 1/4 cup table salt and 1/2 cup water for 12 hours. The gauge should read 75% humidity.

Health Effects of Mold

  • Watery or itchy eyes
  • Sore throat
  • Stuffy nose
  • Coughing
  • Skin irritations
  • May trigger asthma attacks

If you smell a musty odor or see mold, you have a problem. You can have your home tested for mold, but it is very expensive and is not necessary if a problem is observed. Just use your own senses of sight and smell to identify if you have a mold problem.

Molds grow on organic materials, such as wallpaper, carpet, wood, Sheetrock and soap scum. Excessive moisture allows mold to grow rapidly. Mold must be removed since even dead mold can cause problems to our health. Some people are at higher risk for adverse reactions to mold.

Attic Ventilation

Poor or inadequate attic ventilation can lead to problems such as wet insulation, water-damaged ceilings, rotting wood and mold growth. Provide attic ventilation at the eave and the peak or ridge.

Ice Dams

Ice dams occur when escaping heat melts snow on the roof and the water freezes when it reaches the eaves. Reduce the potential for ice dams by providing adequate attic insulation and ventilation, and reducing any air paths from the living space to the attic.

Crawl Space

Crawl spaces and basements can be sources of moisture in a home. Moisture can move through the soil or porous concrete and into the home. Crawl spaces should have a vapor retarder on the soil that is sealed to the foundation. Otherwise, moisture in the crawl space can lead to mold growth.


Controlling moisture by drainage is important. Install at least 6 inches of gravel underneath the basement concrete floor. This provides a water drainage layer and radon removal layer. Also, provide gradual ground slope away from the home and extend down spouts away from the house.

Control Mites

  • Keep humidity less than 50%
  • Wash sheets weekly in 130 degrees or hotter
  • Vacuum mattress, chairs and carpeting regularly
  • Replace pillows every five years

Moisture can affect indoor air quality by increasing dust mite populations. Dust mites are tiny creatures that feed on human skin cells that are shed every day. Some people allergic to dust mites will have symptoms such as a runny nose or watery eyes. Dust mites prefer moist environments and soft textures, including bedding, upholstery fabrics and carpeting. Mites do not normally live in the dry environment of a furnace or air-conditioning duct.


  • Keep clean by changing water
  • Keep clean by cleaning reservoir tanks
  • Keep area around humidifier dry

If not routinely cleaned, humidifiers blow microorganisms into the air. Reduce the possibility of contaminating the air you breathe by cleaning regularly according to the manufacturer’s recommendations and rinsing well with water. Ultrasonic and impeller humidifiers may disperse minerals and other pollutants from the water into the air. Bacteria may be dispersed from dirty humidifiers.

Reduce Carbon Monoxide Risk

  • Use carbon monoxide detectors
  • Service furnace every one to two years
  • Vent space heaters outdoors
  • Do not idle vehicle in garage

Carbon monoxide is deadly. It is an odorless, colorless gas. Symptoms are similar to the flu, with headache, dizziness or a sleepy feeling common. Every home should have a carbon monoxide detector if combustion heating (furnace or water heater) is used. To help prevent carbon monoxide (CO) poisonings, the U.S. Consumer Product Safety Commission (CPSC) urges consumers to have a professional inspection of all fuel-burning heating systems, including furnaces, boilers, fireplaces, water heaters, space heaters, chimneys, flues, and vents.

Radon Detector

Radon is a colorless, odorless radioactive gas that increases the potential for lung cancer. The gas results from the natural decay of uranium and radium. It is found in low amounts worldwide. In North Dakota, 60% of tested homes had elevated levels in an EPA study. Elevated radon levels were found in 60% of the homes in the Red River Valley and 40% of homes in other Minnesota locations. Test your home for radon using a kit from a hardware store, the American Lung Association ( or your local public health district. Send the canister to the lab indicated with the kit.

Air Cleaners


  • how well it collects particles (percent efficiency rate)
  • how much air it draws through

The best method to reduce indoor pollutants is to remove the source, next is to dilute the pollutant through ventilation, then to remove some of the pollutant by using an air cleaner.

Air filters are the most effective and least costly method to remove particles in the air. Both the percentage of particles removed and the volume of air filtered must be considered in evaluating the effectiveness of air cleaners. They are not designed to remove gas such as radon or carbon monoxide.

Poor indoor air quality may affect health immediately or possibly years later (such as lung cancer). If you experience dizziness, fatigue, or irritations of the eyes, nose or throat, pay attention to the time and place symptoms occur. Note if the symptoms fade when you are away from home and recur once home. It is a good idea to improve air quality in your home even before sensitivity starts. Individuals have their specific sensitivity, which varies greatly from person to person. By taking simple preventive steps, you can keep your home healthy!

HVAC or Heating, Ventilating and Air Conditioning, covers just about everything to do with the HVAC equipment in your home, business, or environment for your comfort.

There’s little doubt that the components that make up the HVAC system (heating, ventilation and air conditioning) are some of the most critical features of your home. Installed and maintained properly, these systems have a major impact on your comfort and health. When considering a new home or renovation of an old one, it’s worth taking the time and investing the money to select the right systems to guarantee a long, comfortable life span for you and your home.

A Minnesota heating, ventilating, and air conditioning professional can help you decide which HVAC system and brand is right for you to Keep Your Home Healthy

There are many different types of HVAC equipment systems to choose from and every house is different based on several factors. From the size of your home to the number of trees that shade the west side of your home, many considerations must be taken in selecting the perfect HVAC system for you.  A home performance analysis is the best way to find out how safe your home is and how well it’s being cooled, heated and ventilated.

Source: University of MN