![How a cooling and heating system works](http://windowairconditioner.net/wp-content/themes/theme/assets/img/hvac-145-min.jpg)
How a cooling and heating system works
The filtered air is then circulated back into the home through the ductwork and into the rooms It is the middle of the week and last night was probably the coldest night we have had this winter so far. The temp was about 10 degrees below zero and somehow I managed to leave my bedroom