AFUE
Definition to come.
Where it comes up
- Gas furnaces
How a gas furnace heats, what AFUE means and the signs worth a closer look
- Older furnaces
Gravity and coal-era furnaces, gas conversions and how to judge a furnace's age
- Steam heat
How steam boilers and radiators work, air vents, banging and boiler rules
- Hot-water heat
How hot-water boilers and radiators work, bleeding, pressure and efficiency
- How gas appliances burn and vent
Combustion air, flues, vent categories and condensing furnaces
- Efficiency ratings
What AFUE, SEER2, EER2 and HSPF2 mean and how to read them
- Repair or replace
Age, repairs and bills, R-22 systems, efficiency, sizing and what to ask