The heating and cooling system in your home was designed to maintain a constant temperature, no matter the season. In the height of summer or dead of winter, though, the cost of running your A/C or furnace can quickly increase, leaving homeowners scrambling to improve energy efficiency.

One common suggestion is to close bedroom doors, but can you save energy by closing doors?

The idea behind leaving a bedroom door closed, or shutting HVAC vents in unused rooms, to improve energy efficiency is that it limits the amount of air movement required, as well as the space that needs to be heated or cooled.

In turn, this should lower costs and save money on utility bills.  On the surface, this makes sense. Simple cost savings, right? Not exactly.

In fact, the reverse is true, according to the nonprofit publication Home Energy.

When interior doors are closed, the room is placed under pressure because airflow is now blocked. Air trapped in the pressurized bedroom, however, doesn’t stay contained. It will find ways to escape.

Any air lost is replaced in an equal amount, which can increase the amount of air being drawn from 300 percent to 900 percent, significantly increasing utility bills.

This replacement air comes through the chimney, water heater or furnace flue, and it creates a steady draft in your home. Because the air isn’t coming through your HVAC system, it isn’t being filtered, which means it contains everything from dirt and dust to humidity and carbon monoxide (CO).

The result can be damage to your home or danger to the occupants in the form of high CO levels or possible mold growth that can make you sick.

Contact Shamrock Heating and Air Conditioning to find out ways you can improve energy efficiency and breathe easy without sweating the electric and heating bills.