FurnaceTally
Input BTU, output BTU, and the gap nobody explains.
| Sections | Latest |
|---|---|
| Furnace BTU SizingInput against output, and how much of the label you actually get. | 360 |
| AFUE & EfficiencyWhat 80% and 96% mean on a bill, and when the upgrade pays back. | 1 |
| Venting & Combustion AirCategory I against Category IV, vent sizing, and why a high-efficiency swap changes the chimney. | 1 |
| Fuel & Running CostGas, propane and electric compared per delivered BTU rather than per unit. | 1 |
| Replacement CostFurnace, install, and the venting work that turns a quote into a project. | 204 |
- Water Dripping From the Furnace Vent — Normal on One Type, a Fault on the Other
The same drip is expected on one furnace and dangerous on another. Which one you have is decided by the vent material, and you can see it from across the room.
- Gas Bill Went Up After a New Furnace — Five Reasons That Are Not the Furnace
Compare therms against degree days, not dollars against last year. Half of these complaints disappear the moment the weather is normalised out.
- New High-Efficiency Furnace Short Cycles — Usually the Sizing
The upgrade from 80% to 96% adds a fifth more heat from the same size box. Keep the input the same and you have just oversized the house by 20%.
Furnace BTU by area, climate and AFUE
360 calculations · Furnace BTU Sizing · browse all
- What size furnace for 600 square feet in zone 1–2 at 80% AFUE
- What size furnace for 1000 square feet in zone 5 at 80% AFUE
- What size furnace for 1600 square feet in zone 1–2 at 80% AFUE
- What size furnace for 2000 square feet in zone 5 at 80% AFUE
- What size furnace for 2600 square feet in zone 1–2 at 80% AFUE
- What size furnace for 3000 square feet in zone 5 at 80% AFUE
Furnace replacement cost by state
204 calculations · Replacement Cost · browse all