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Discover efficient gas heating furnaces at National Air Warehouse. Stay warm and comfortable this winter. Explore our reliable heating solutions now!
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Need help choosing the right system or part? Curious about how shipping works? Call or live chat to speak with one of our knowledgeable professionals, Mon – Fri 8AM to 5PM ET.
In Stock BOSCH (BGH97 Series) 97% AFUE 100,000 BTU Two-Stage Up-flow/Horizontal Gas Furnace BGH97M100C5 BGH97M100C5 · Two-Stage
$3,420.35
Shipping included
In Stock BOSCH (BGH97 Series) 97% AFUE 100,000 BTU Two-Stage Up-flow/Horizontal Gas Furnace BGH97M100D5 BGH97M100D5 · Two-Stage
$3,514.96
Shipping included
In Stock BOSCH (BGH97 Series) 97% AFUE 60,000 BTU Two-Stage Upflow/Horizontal Gas Furnace BGH97M060B3 BGH97M060B3 · Two-Stage
$3,043.82
Shipping included
In Stock BOSCH (BGH97 Series) 97% AFUE 80,000 BTU Two-Stage Up-flow/Horizontal Gas Furnace BGH97M080C4 BGH97M080C4 · Two-Stage
$3,306.93
Shipping included
In Stock BOSCH (BGH97 Series) 97% AFUE 80,000 BTU Two-Stage Upflow/Horizontal Gas Furnace BGH97M080B3 BGH97M080B3 · Two-Stage
$3,109.31
Shipping included
In Stock BRYANT Legacy Line 80% AFUE 45,000 BTU Single Stage Multi-Position Gas Furnace 17.5″ Wide 800SB42045M17 800SB42045M17 · Single-Stage
$2,422.96
Shipping included
In Stock BRYANT Legacy Line 80% AFUE 70,000 BTU Single Stage Multi-Position Gas Furnace 17.5″ Wide 800SB48070M17 800SB48070M17 · Single-Stage
$2,449.53
Shipping included
In Stock Goodman 80% AFUE 100,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Downflow/Horizontal) GD9S801005CN GD9S801005CN · Single-Stage
$2,065.66
Shipping included
In Stock Goodman 80% AFUE 100,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Upflow/Horizontal) GR9S801005CN GR9S801005CN · Single-Stage
$1,910.28
Shipping included
In Stock 
In Stock Goodman 80% AFUE 120,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Upflow/Horizontal) GR9S801205DN GR9S801205DN · Single-Stage
$2,066.21
Shipping included
In Stock Goodman 80% AFUE 40,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Downflow/Horizontal) GD9S800403AN GD9S800403AN · Single-Stage
$1,692.25
Shipping included
In Stock Goodman 80% AFUE 40,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Upflow/Horizontal) GR9S800403AN GR9S800403AN · Single-Stage
$1,661.20
Shipping included
In Stock Goodman 80% AFUE 60,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Downflow/Horizontal) GD9S800603AN GD9S800603AN · Single-Stage
$1,740.55
Shipping included
In Stock Goodman 80% AFUE 60,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Upflow/Horizontal) GR9S800603AN GR9S800603AN · Single-Stage
$1,714.33
Shipping included
In Stock Goodman 80% AFUE 60,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Upflow/Horizontal) GR9S800604BN GR9S800604BN · Single-Stage
$1,737.10
Shipping included
In Stock In Stock Goodman 80% AFUE 80,000 BTU Single-Stage 9-Speed ECM Gas Furnace (Downflow/Horizontal) GD9S800804BN GD9S800804BN · Single-Stage
$1,877.85
Shipping included
Gas furnaces at wholesale prices
Replace just the heating side of your system with a new gas furnace. We carry more than 70 furnaces from Goodman, Rheem, Bosch and Bryant, from 40,000 to 125,000 BTU and 80% to 98% AFUE.
Choosing a furnace
- Size (BTU): depends on your climate, square footage and insulation. Use our furnace sizing calculator and have your contractor confirm with a load calculation.
- Efficiency (AFUE): 80% AFUE furnaces use a standard metal flue and cost less up front. 92% to 98% AFUE condensing furnaces vent through PVC, need a condensate drain and cut gas bills, especially in colder climates.
- Airflow direction: upflow for basements and closets, horizontal for attics and crawlspaces, downflow for floor duct systems. Many models are multi-position; check the product page.
- Cabinet width: common widths are 14", 17.5", 21" and 24.5". Match your space and the indoor coil above the furnace.
Comfort options
Single-stage
Runs at full output whenever it's on.
Two-stage
Runs at a lower setting most of the time for quieter, more even heat.
Modulating / variable-speed
Adjusts output and airflow in small steps for the steadiest temperatures.
Propane: for homes without natural gas, many furnaces can run on propane with a manufacturer conversion kit. Check the product page for the matching kit, and have your installer do the conversion.
Shipping, returns and warranty
Free shippingIncluded on orders to the continental US, with lift-gate service to homes.
Fast dispatchShips by LTL freight in 3 to 4 business days.
Tampa pickupWill-call pickup at our Tampa warehouse, Monday to Friday.
30-day returnsUnused items in original packaging, within 30 days of delivery.
Manufacturer warranties apply when a licensed HVAC contractor installs the equipment.
Frequently asked questions
Can I replace my furnace without replacing my AC?
Yes, if your AC coil fits the new furnace cabinet. If the AC is also aging, a Gas Furnace + AC System is usually the better value.
Can I switch from an 80% to a 96% furnace?
Yes. Your installer will add PVC venting and a condensate drain, so budget for that work.
Need help choosing a furnace?Call us Monday to Friday, 8am to 5pm ET.