Before You Buy

What is the proper size HVAC system for my home?
How can I compare HVAC systems?
When should you buy a new heating and cooling system?

Operation

Can frost, ice, dirt or other debris keep the outdoor unit of my cooling system from operating effectively?
Is there a difference in the Air Conditioner Heat Pump and Furnace sound levels?
How long does a typical new HVAC system last?
All this talk about efficiency.. What should I do?