Our heater and AC unit was over 20 years old and we had it repaired several times but it reached the point where it was senseless to put any more money into it. About three years ago we had a HVAC unit installed. The brand is Frigidaire and we are very pleased with it. It heats and cools just fine. The system connected to our old ductwork and has a heat pump. I'm still no expert on this stuff but we have no complaints.
To our surprise our electric bill has been cut by 1/3 so the system has been paying for itself. Good luck on your decision.
