HVAC contractors love selling elite 18 to 22-SEER communicating heat pumps. While these machines are incredible pieces of technology, pairing a 20-SEER compressor with R-19 attic insulation is the equivalent of dropping a Ferrari V12 engine into a pickup truck with flat tires.
The High-SEER Illusion
A high SEER rating simply means the compressor uses less electricity per hour of runtime. However, if your home has massive thermal leaks, that high-SEER unit still has to run 14 hours a day to keep the house at 72°F. The runtime volume completely destroys the efficiency gains.
The Insulation Multiplier
If you upgrade to R-49 insulation and seal the ductwork before buying an HVAC, the house suddenly retains its chilled air. That same high-SEER unit now only needs to run 6 hours a day. Because the runtime is halved, the mechanical lifespan of the compressor literally doubles.
The The Very Good Home Company Order of Operations
Never buy a new AC unit before fixing your thermal envelope. Upgrading your insulation first often allows you to buy a smaller, cheaper 3-Ton unit instead of a massive 5-Ton system, saving you $3,000+ instantly on equipment size alone.