what does hvac actually do?
As much as half of the energy used in your home goes to heating and cooling. So making smart decisions about your home's heating, ventilating, and air conditioning (HVAC) system can have a big effect on your utility bills â and your comfort.Take these steps to increase the efficiency of your heating and cooling system.o making smart decisions about your home's heating, ventilating, and air conditioning (HVAC) system can have a big effect on your utility bills â and your comfort. Take these steps to increase the efficiency of your heating and cooling system.