In Reply to: MIght be time for a new furnace posted by Farmer Dan on October 16, 2017 at 09:49:44:
The installation quality is just as important as the quality of the system.
Contrary to some misinformation, a quality system that is maintained will last a very long time. Our current 98% system with multiple zones, variable speed fan, and high efficiency air conditioner is closing in on 20 years old with zero problems. It heats and cools just over 4,000 square feet with an electric bill that has never exceeded $100/month. Propane costs us around $700/year depending on the current price per gallon.
At our lake home (1,800 square feet) we replaced the late 70's vintage furnace and air conditioner 4 years ago with a similar high efficiency, high quality system. Again, there have been zero problems and operational costs are extremely low.
The new fangled "weak point" thermostats in both systems work extremely well. We like it cool at night so it automatically drops the temperature in the winter, and in the summer sets the master suite zone for a lower temperature while keeping the rest of the house at normal temperatures. The non-mercury switch thermostats in our primary home are nearly 20 years old (Honeywell) and have worked without a single issue. The thermostat in our lake house is 4 years old, and we haven't had a single issue.
All of our equipment is Lennox.
You get what you pay for-buy a "builders grade" system and you can expect issues. Buy a quality system and you can expect years of trouble free service.