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Alpine AHDGAH077

77,000 BTU LOW-PROFILE Mobile Home Furnace, 80% Efficiency, Downflow Application

(4 Reviews)


  • Liftgate Delivery $25
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  • Pro Installation

The low-profile AHDGAH, 80% AFUE single-stage, downflow, mobile home furnace is a shorter version of the AHDGAA models. It is made by Coleman and features an aluminized steel heat exchanger, and is ideal for installation in tight places and/or heat only applications. The more compact size is achieved by eliminating the built in cabinet for an air conditioning evaporator coil. The AHDGAH installs conveniently into closets or alcoves, requiring only 2 inches of clearance on the top, no clearance on the sides or rear of the unit, and a small clearance for service on the front (2 inches for closet installations and 24 inches in an alcove).

Note: When replacing a mobile home gas furnace, replace the roof jack as well. Click the Accessories tab or “Buy Now” to view roof jacks and other accessories that fit this furnace.

Please read this Important Safety Notice.


  • Low-profile design for installation in tight places
  • Extremely quiet starting and operation
  • Sealed Combustion, (combustion air drawn through the roof jack and pushed into the burner box. Flue gas is forced from the heat exchanger by the vent blower and discharged through the flue pipe to the outside atmosphere)
  • Automatic hot surface igniter
  • Aluminized steel heat exchanger
  • LP (propane) conversion kit provided with furnace, no other parts required
  • High altitude kit not required - derating accomplished by reducing the orifice size (Please call for assistance with selecting proper orifice.)

THESE FURNACES MUST BE INSTALLED WITH A NEW MATCHING ROOF JACK (EXHAUST VENT) FOR SAFETY REASONS. Using the wrong roof jack could result in an explosion. You cannot use a roof jack from an older model furnace or a different brand of mobile home furnace. Please click the 'Accessories' tab above to view roof jacks for this furnace.


Configuration is the direction the conditioned air will pass through the unit.

Upflow units will have the air come in from the bottom and blow out the top.

Horizontal units will have the air go through the unit left to right, or right to left.

Downflow units will have the air come in from the top of the unit, and blow out the bottom.

Unsure of what configuration your home needs? Call us at 800-865-5931. Monday through Friday, 8:30am to 5:00pm CST

Blower Cooling Capacity

The tonnage of air conditioning that can be moved effectively by the blower. You want to make sure that the blower is appropriately sized for the air conditioner. If it is too small the coil could ice up. If it is too large than the air coming out of the ducts won't be cold enough.

Blower Cooling Capacity
4 Tons
Maximum Input BTU

The maximum amount of heat that the unit can produce. The amount delivered into the space will be the input minus the efficiency loss also know as the output. For example a 100000 btu furnace at 80% efficiency will give you 80000 out btus of heat. The same size furnace at 95% will give you 95000 btus of heat.

Maximum Input BTU
77,000 BTU
Maximum Heating Output BTU

The amount of heat, rated in British Thermal Units (BTUs), that the unit can deliver into the space. Not sure how many BTUs you need? Try our easy Equipment Sizing Estimator.

Maximum Heating Output BTU
62,000 BTU
Efficiency (% AFUE)

The percentage of energy converted into output by the unit. The remaining percentage is lost during the conversion process. The higher the efficiency, the lower the operational cost.

Efficiency (% AFUE)
80 %
Blower Type

There are three main type of blowers: Multi-Speed, High-Efficiency Multi-Speed, and Variable Speed.

Standard Multi-Speed blowers have different speed options and you select the speed that the blower will operate at depending on the function it is performing (ex. different speeds for fan, AC, and heating functions).

High-Efficiency Multi-Speed blowers are designed to maintain a constant torque and in doing so will maintain air-flow and use less electricity.

Variable Speed blowers will adjust their speed during operation. The result is a blower that will run at lower speeds for longer periods of time (this improves the air flow and increases electrical efficiency).

Blower Type
Maximum Overcurrent Protection (Breaker)

The maximum capacity breaker in the building's circuit panel that can be used on the dedicated electrical line supplying the equipment.

Maximum Overcurrent Protection (Breaker)
15 Amps
Fuel Type
Liquid Propane / Natural Gas
Roof Jack Size
10 Inch Diameter
Product Weight
131 lbs
Meets CSA Standards

Canadian Standards Association

Meets CSA Standards
Meets Canadian OEE Standards

Standards established by Canada's Office of Energy Efficiency.

Meets Canadian OEE Standards
19 1/2 Inches
24 1/2 Inches
60 Inches
Heat Exchanger Warranty
10 Years
Parts Warranty
2 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.