Proper humidity levels
keep you healthier and more comfortable.
Your heating, ventilation, and air conditioning (HVAC)
system can do more than heat and cool your home. It can also keep the humidity
at a comfortable level in winter and summer. It’s a delicate balance: if it’s
too low, you’ll feel the effects of colds, respiratory infections, and asthma
more, and some of the furnishings in your home will literally dry out. If it’s
too high, you’ll be uncomfortable but mold and mildew will flourish. They love
Residential HVAC systems balance temperature and humidity.
The best person to design a system appropriate for your climate and your
comfort needs is a professional ACCA member contractor. He or she understands
the science of your home and applies the principles contained in the ACCA
design and technical manuals to the design, selection, and installation of an
HVAC system that’s right for you.
ACCA manuals are the industry standard, often incorporated
into local building codes and endorsed or recommended by the Department of
Energy, the Environmental Protection Agency, and equipment manufacturers.
Relatively Speaking …
Relative humidity (RH) is the percent of moisture actually
in the air compared to the maximum amount of moisture the air can hold at that
temperature. Cold air can hold less moisture than warm air. At 70ºF, air can
hold as much as 12 times the amount of moisture as 10ºF air. That’s why it’s
usually more humid in the hot summer months.
Most heating systems just heat the air, changing the
temperature, not the humidity. Cold air is dry, and forced-air systems and heat
pumps pull outside air for heating. When 10°F outside air is heated to 70°F,
the humidity level in your home will be the same as the outside air’s, around
7%. That’s one reason your skin feels dryer, perhaps even chapped, in the
winter. So in dry cold climates, you will probably want to add a humidifier to
your heating system.
The effects of bacteria, viruses, fungi, respiratory infections,
allergic rhinitis and asthma, and ozone production during the winter can be
minimized by higher humidity levels. Studies have shown that wintertime levels
of 68°F/60% RH are just as comfortable as 72°F/30% RH; so by increasing the RH
and lowering the temperature, you will minimize negative effects while lowering
your utility bills.
Because the outside air temperature and RH can change in a
short time, even a few hours, a computer-controlled humidifier is probably your
best choice. It will automatically adjust for these fluctuations to provide
enough moisture for a healthy, comfortable home and minimize or prevent window
and cold surface condensation.
Air conditioners pull moisture from the air (HVAC
professionals call that “latent heat,” as opposed to “sensible heat,” the
temperature) as they cool it, which is one reason you feel better in an air
conditioned home. If they didn’t, you’d feel cold and clammy instead of cool
and comfortable. In particularly hot and humid climates, however, you may need
to augment the dehumidifying capacity of your system.
Very high moisture levels give you that “sticky” feeling and
may lead to health problems resulting from the growth of bacteria, viruses,
fungi, dust mites, and mold. Air at 78°F/30% RH provides the same level of
comfort as does 74°F/70% RH air. In the summer, turning the thermostat up lowers your utility bills, so
dehumidifying can save you money as well as add to your comfort.
Although your air conditioning system or stand-alone
dehumidifier is designed to remove moisture and decrease the RH levels in your
home, in very humid areas of the country, it may not be capable of lowering the
levels below 60% RH. In such cases, your ACCA quality contractor may suggest
alternative or additional equipment and control strategies.
It’s Your Choice!
The choice is yours: a comfort and health indoor air system, or a furnace/boiler and an air
conditioner. Since more than a third of your time is spent in your home, it is
important to make the right choice.