: Replacing both at once means your coverage starts on the same day, simplifying future service.
: Modern features like variable-speed blowers or communicating thermostats work best when both units are designed to talk to each other. 2. Key Efficiency Ratings to Know buy furnace and air conditioner
According to the U.S. Department of Energy , these numbers determine your ongoing operating costs: Build Your Own Furnace & AC System - R32 - HVACDirect.com : Replacing both at once means your coverage