Furnace BTU Sizing — full index

All 360 calculations, page 1 of 2.

• What size furnace for 600 square feet in zone 1–2 at 80% AFUE
• What size furnace for 600 square feet in zone 1–2 at 90% AFUE
• What size furnace for 600 square feet in zone 1–2 at 96% AFUE
• What size furnace for 600 square feet in zone 1–2 at 98% AFUE
• What size furnace for 600 square feet in zone 3 at 80% AFUE
• What size furnace for 600 square feet in zone 3 at 90% AFUE
• What size furnace for 600 square feet in zone 3 at 96% AFUE
• What size furnace for 600 square feet in zone 3 at 98% AFUE
• What size furnace for 600 square feet in zone 4 at 80% AFUE
• What size furnace for 600 square feet in zone 4 at 90% AFUE
• What size furnace for 600 square feet in zone 4 at 96% AFUE
• What size furnace for 600 square feet in zone 4 at 98% AFUE
• What size furnace for 600 square feet in zone 5 at 80% AFUE
• What size furnace for 600 square feet in zone 5 at 90% AFUE
• What size furnace for 600 square feet in zone 5 at 96% AFUE
• What size furnace for 600 square feet in zone 5 at 98% AFUE
• What size furnace for 600 square feet in zone 6 at 80% AFUE
• What size furnace for 600 square feet in zone 6 at 90% AFUE
• What size furnace for 600 square feet in zone 6 at 96% AFUE
• What size furnace for 600 square feet in zone 6 at 98% AFUE
• What size furnace for 600 square feet in zone 7 at 80% AFUE
• What size furnace for 600 square feet in zone 7 at 90% AFUE
• What size furnace for 600 square feet in zone 7 at 96% AFUE
• What size furnace for 600 square feet in zone 7 at 98% AFUE
• What size furnace for 800 square feet in zone 1–2 at 80% AFUE
• What size furnace for 800 square feet in zone 1–2 at 90% AFUE
• What size furnace for 800 square feet in zone 1–2 at 96% AFUE
• What size furnace for 800 square feet in zone 1–2 at 98% AFUE
• What size furnace for 800 square feet in zone 3 at 80% AFUE
• What size furnace for 800 square feet in zone 3 at 90% AFUE
• What size furnace for 800 square feet in zone 3 at 96% AFUE
• What size furnace for 800 square feet in zone 3 at 98% AFUE
• What size furnace for 800 square feet in zone 4 at 80% AFUE
• What size furnace for 800 square feet in zone 4 at 90% AFUE
• What size furnace for 800 square feet in zone 4 at 96% AFUE
• What size furnace for 800 square feet in zone 4 at 98% AFUE
• What size furnace for 800 square feet in zone 5 at 80% AFUE
• What size furnace for 800 square feet in zone 5 at 90% AFUE
• What size furnace for 800 square feet in zone 5 at 96% AFUE
• What size furnace for 800 square feet in zone 5 at 98% AFUE
• What size furnace for 800 square feet in zone 6 at 80% AFUE
• What size furnace for 800 square feet in zone 6 at 90% AFUE
• What size furnace for 800 square feet in zone 6 at 96% AFUE
• What size furnace for 800 square feet in zone 6 at 98% AFUE
• What size furnace for 800 square feet in zone 7 at 80% AFUE
• What size furnace for 800 square feet in zone 7 at 90% AFUE
• What size furnace for 800 square feet in zone 7 at 96% AFUE
• What size furnace for 800 square feet in zone 7 at 98% AFUE
• What size furnace for 1000 square feet in zone 1–2 at 80% AFUE
• What size furnace for 1000 square feet in zone 1–2 at 90% AFUE
• What size furnace for 1000 square feet in zone 1–2 at 96% AFUE
• What size furnace for 1000 square feet in zone 1–2 at 98% AFUE
• What size furnace for 1000 square feet in zone 3 at 80% AFUE
• What size furnace for 1000 square feet in zone 3 at 90% AFUE
• What size furnace for 1000 square feet in zone 3 at 96% AFUE
• What size furnace for 1000 square feet in zone 3 at 98% AFUE
• What size furnace for 1000 square feet in zone 4 at 80% AFUE
• What size furnace for 1000 square feet in zone 4 at 90% AFUE
• What size furnace for 1000 square feet in zone 4 at 96% AFUE
• What size furnace for 1000 square feet in zone 4 at 98% AFUE
• What size furnace for 1000 square feet in zone 5 at 80% AFUE
• What size furnace for 1000 square feet in zone 5 at 90% AFUE
• What size furnace for 1000 square feet in zone 5 at 96% AFUE
• What size furnace for 1000 square feet in zone 5 at 98% AFUE
• What size furnace for 1000 square feet in zone 6 at 80% AFUE
• What size furnace for 1000 square feet in zone 6 at 90% AFUE
• What size furnace for 1000 square feet in zone 6 at 96% AFUE
• What size furnace for 1000 square feet in zone 6 at 98% AFUE
• What size furnace for 1000 square feet in zone 7 at 80% AFUE
• What size furnace for 1000 square feet in zone 7 at 90% AFUE
• What size furnace for 1000 square feet in zone 7 at 96% AFUE
• What size furnace for 1000 square feet in zone 7 at 98% AFUE
• What size furnace for 1200 square feet in zone 1–2 at 80% AFUE
• What size furnace for 1200 square feet in zone 1–2 at 90% AFUE
• What size furnace for 1200 square feet in zone 1–2 at 96% AFUE
• What size furnace for 1200 square feet in zone 1–2 at 98% AFUE
• What size furnace for 1200 square feet in zone 3 at 80% AFUE
• What size furnace for 1200 square feet in zone 3 at 90% AFUE
• What size furnace for 1200 square feet in zone 3 at 96% AFUE
• What size furnace for 1200 square feet in zone 3 at 98% AFUE
• What size furnace for 1200 square feet in zone 4 at 80% AFUE
• What size furnace for 1200 square feet in zone 4 at 90% AFUE
• What size furnace for 1200 square feet in zone 4 at 96% AFUE
• What size furnace for 1200 square feet in zone 4 at 98% AFUE
• What size furnace for 1200 square feet in zone 5 at 80% AFUE
• What size furnace for 1200 square feet in zone 5 at 90% AFUE
• What size furnace for 1200 square feet in zone 5 at 96% AFUE
• What size furnace for 1200 square feet in zone 5 at 98% AFUE
• What size furnace for 1200 square feet in zone 6 at 80% AFUE
• What size furnace for 1200 square feet in zone 6 at 90% AFUE
• What size furnace for 1200 square feet in zone 6 at 96% AFUE
• What size furnace for 1200 square feet in zone 6 at 98% AFUE
• What size furnace for 1200 square feet in zone 7 at 80% AFUE
• What size furnace for 1200 square feet in zone 7 at 90% AFUE
• What size furnace for 1200 square feet in zone 7 at 96% AFUE
• What size furnace for 1200 square feet in zone 7 at 98% AFUE
• What size furnace for 1400 square feet in zone 1–2 at 80% AFUE
• What size furnace for 1400 square feet in zone 1–2 at 90% AFUE
• What size furnace for 1400 square feet in zone 1–2 at 96% AFUE
• What size furnace for 1400 square feet in zone 1–2 at 98% AFUE
• What size furnace for 1400 square feet in zone 3 at 80% AFUE
• What size furnace for 1400 square feet in zone 3 at 90% AFUE
• What size furnace for 1400 square feet in zone 3 at 96% AFUE
• What size furnace for 1400 square feet in zone 3 at 98% AFUE
• What size furnace for 1400 square feet in zone 4 at 80% AFUE
• What size furnace for 1400 square feet in zone 4 at 90% AFUE
• What size furnace for 1400 square feet in zone 4 at 96% AFUE
• What size furnace for 1400 square feet in zone 4 at 98% AFUE
• What size furnace for 1400 square feet in zone 5 at 80% AFUE
• What size furnace for 1400 square feet in zone 5 at 90% AFUE
• What size furnace for 1400 square feet in zone 5 at 96% AFUE
• What size furnace for 1400 square feet in zone 5 at 98% AFUE
• What size furnace for 1400 square feet in zone 6 at 80% AFUE
• What size furnace for 1400 square feet in zone 6 at 90% AFUE
• What size furnace for 1400 square feet in zone 6 at 96% AFUE
• What size furnace for 1400 square feet in zone 6 at 98% AFUE
• What size furnace for 1400 square feet in zone 7 at 80% AFUE
• What size furnace for 1400 square feet in zone 7 at 90% AFUE
• What size furnace for 1400 square feet in zone 7 at 96% AFUE
• What size furnace for 1400 square feet in zone 7 at 98% AFUE
• What size furnace for 1600 square feet in zone 1–2 at 80% AFUE
• What size furnace for 1600 square feet in zone 1–2 at 90% AFUE
• What size furnace for 1600 square feet in zone 1–2 at 96% AFUE
• What size furnace for 1600 square feet in zone 1–2 at 98% AFUE
• What size furnace for 1600 square feet in zone 3 at 80% AFUE
• What size furnace for 1600 square feet in zone 3 at 90% AFUE
• What size furnace for 1600 square feet in zone 3 at 96% AFUE
• What size furnace for 1600 square feet in zone 3 at 98% AFUE
• What size furnace for 1600 square feet in zone 4 at 80% AFUE
• What size furnace for 1600 square feet in zone 4 at 90% AFUE
• What size furnace for 1600 square feet in zone 4 at 96% AFUE
• What size furnace for 1600 square feet in zone 4 at 98% AFUE
• What size furnace for 1600 square feet in zone 5 at 80% AFUE
• What size furnace for 1600 square feet in zone 5 at 90% AFUE
• What size furnace for 1600 square feet in zone 5 at 96% AFUE
• What size furnace for 1600 square feet in zone 5 at 98% AFUE
• What size furnace for 1600 square feet in zone 6 at 80% AFUE
• What size furnace for 1600 square feet in zone 6 at 90% AFUE
• What size furnace for 1600 square feet in zone 6 at 96% AFUE
• What size furnace for 1600 square feet in zone 6 at 98% AFUE
• What size furnace for 1600 square feet in zone 7 at 80% AFUE
• What size furnace for 1600 square feet in zone 7 at 90% AFUE
• What size furnace for 1600 square feet in zone 7 at 96% AFUE
• What size furnace for 1600 square feet in zone 7 at 98% AFUE
• What size furnace for 1800 square feet in zone 1–2 at 80% AFUE
• What size furnace for 1800 square feet in zone 1–2 at 90% AFUE
• What size furnace for 1800 square feet in zone 1–2 at 96% AFUE
• What size furnace for 1800 square feet in zone 1–2 at 98% AFUE
• What size furnace for 1800 square feet in zone 3 at 80% AFUE
• What size furnace for 1800 square feet in zone 3 at 90% AFUE
• What size furnace for 1800 square feet in zone 3 at 96% AFUE
• What size furnace for 1800 square feet in zone 3 at 98% AFUE
• What size furnace for 1800 square feet in zone 4 at 80% AFUE
• What size furnace for 1800 square feet in zone 4 at 90% AFUE
• What size furnace for 1800 square feet in zone 4 at 96% AFUE
• What size furnace for 1800 square feet in zone 4 at 98% AFUE
• What size furnace for 1800 square feet in zone 5 at 80% AFUE
• What size furnace for 1800 square feet in zone 5 at 90% AFUE
• What size furnace for 1800 square feet in zone 5 at 96% AFUE
• What size furnace for 1800 square feet in zone 5 at 98% AFUE
• What size furnace for 1800 square feet in zone 6 at 80% AFUE
• What size furnace for 1800 square feet in zone 6 at 90% AFUE
• What size furnace for 1800 square feet in zone 6 at 96% AFUE
• What size furnace for 1800 square feet in zone 6 at 98% AFUE
• What size furnace for 1800 square feet in zone 7 at 80% AFUE
• What size furnace for 1800 square feet in zone 7 at 90% AFUE
• What size furnace for 1800 square feet in zone 7 at 96% AFUE
• What size furnace for 1800 square feet in zone 7 at 98% AFUE
• What size furnace for 2000 square feet in zone 1–2 at 80% AFUE
• What size furnace for 2000 square feet in zone 1–2 at 90% AFUE
• What size furnace for 2000 square feet in zone 1–2 at 96% AFUE
• What size furnace for 2000 square feet in zone 1–2 at 98% AFUE
• What size furnace for 2000 square feet in zone 3 at 80% AFUE
• What size furnace for 2000 square feet in zone 3 at 90% AFUE
• What size furnace for 2000 square feet in zone 3 at 96% AFUE
• What size furnace for 2000 square feet in zone 3 at 98% AFUE
• What size furnace for 2000 square feet in zone 4 at 80% AFUE
• What size furnace for 2000 square feet in zone 4 at 90% AFUE
• What size furnace for 2000 square feet in zone 4 at 96% AFUE
• What size furnace for 2000 square feet in zone 4 at 98% AFUE
• What size furnace for 2000 square feet in zone 5 at 80% AFUE
• What size furnace for 2000 square feet in zone 5 at 90% AFUE
• What size furnace for 2000 square feet in zone 5 at 96% AFUE
• What size furnace for 2000 square feet in zone 5 at 98% AFUE
• What size furnace for 2000 square feet in zone 6 at 80% AFUE
• What size furnace for 2000 square feet in zone 6 at 90% AFUE
• What size furnace for 2000 square feet in zone 6 at 96% AFUE
• What size furnace for 2000 square feet in zone 6 at 98% AFUE
• What size furnace for 2000 square feet in zone 7 at 80% AFUE
• What size furnace for 2000 square feet in zone 7 at 90% AFUE
• What size furnace for 2000 square feet in zone 7 at 96% AFUE
• What size furnace for 2000 square feet in zone 7 at 98% AFUE
• What size furnace for 2200 square feet in zone 1–2 at 80% AFUE
• What size furnace for 2200 square feet in zone 1–2 at 90% AFUE
• What size furnace for 2200 square feet in zone 1–2 at 96% AFUE
• What size furnace for 2200 square feet in zone 1–2 at 98% AFUE
• What size furnace for 2200 square feet in zone 3 at 80% AFUE
• What size furnace for 2200 square feet in zone 3 at 90% AFUE
• What size furnace for 2200 square feet in zone 3 at 96% AFUE
• What size furnace for 2200 square feet in zone 3 at 98% AFUE