I replaced a twenty five year old heater and central ac unit. The old units were trouble free till the very end... cracked cast iron manifold in heater and rotting coils in outside unit of ac... 25 years... not too bad.
Replace them with Bryant furnace and central ac unit five years ago. The ac has gone out four times in the last 3 years. One time contact points, twice condenser once the Freon leaked out and the heaters has had the ignitable... a little piece of metal that cost me $ 160 ... looked like a five dollar part. Electricity flows threw it and it turns orange to light the burner. $160 dollars and it last two years??? Are all brands junk like what I got???