Is 80,000 BTU enough for my house?

It suits many medium homes, roughly 1,500 to 2,200 square feet in a moderate climate. Have a contractor run a load calculation; oversized furnaces short-cycle and undersized ones never keep up.

Does it need a chimney or can it vent out a side wall?

It is non-condensing and vents through a traditional metal flue, typically a chimney or B-vent. Side-wall venting requires a 90%+ condensing furnace instead.

Can I add air conditioning to it?

Yes. Add a matching cased evaporator coil and an outdoor condenser; the ECM blower handles cooling airflow. The furnace alone provides heat only.

Can it run on propane?

Yes, with an LP conversion kit and orifices, which are not included. The unit ships set up for natural gas.

When is the price lowest?

Furnace prices tend to dip in shoulder seasons, spring and early fall, before heating demand peaks. The best new price was $1,200.00 at IB Lighting as of November 7, 2026.

What comes in the box?

The furnace, an installation guide and the manufacturer warranty. A flue, thermostat, filter and gas piping are bought separately.

Goodman 80,000 BTU 80% AFUE Single-Stage Gas Furnace – GR9S800803BN

Q: Where is the Goodman 80,000 BTU 80% AFUE Single-Stage Gas Furnace – GR9S800803BN cheapest?

At IB Lighting, for $1,200.00, as of our latest check.

Q: Where can I buy the Goodman 80,000 BTU 80% AFUE Single-Stage Gas Furnace – GR9S800803BN?

6 stores we checked sell it, including Superior Home Supplies, IB Lighting, hvac place, Lowe's, Amazon.

Best price now

$1,200.00at IB LightingObserved at 8:44 AM

Compared across 5 stores. Prices are checked against each store and labelled with when.

Visit IB Lighting

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

What reviewers say

Owner feedback on this Goodman line centers on value and simple service, with complaints about noise and blower settings.

What people mention

ValuePraisedOwners say it delivers the heat for far less money than premium brands.
NoiseMixedSome find it quiet at low blower speeds; others hear the burner and blower on high.
InstallationPraisedThe upflow/horizontal layout and standard flue make replacement swaps quick.
EfficiencyCriticisedAt 80% AFUE it costs more to run than a 90%+ condensing furnace.
Temperature swingCriticisedThe single-stage valve cycles full-on and off, so room temperature drifts more.

About the Goodman 80,000 BTU 80% AFUE Single-Stage Gas Furnace – GR9S800803BN

The Goodman GR9S800803BN is a dependable 80,000 BTU gas furnace designed to deliver consistent, cost-effective heating for medium-sized homes. With an 80% AFUE efficiency rating and a multi-speed ECM blower motor, this unit provides reliable performance while maintaining steady airflow and indoor comfort throughout the heating season.

Built for durability and ease of installation, this furnace supports both upflow and horizontal configurations, making it a versatile replacement option for older 80% furnaces. Whether you're upgrading an aging system or installing a new one, the GR9S800803BN offers proven Goodman reliability at an affordable price point.

Key Features & Benefits

• 80,000 BTU heating capacity for consistent whole-home warmth

• 80% AFUE efficiency for reliable, standard-efficiency performance

• Multi-speed ECM blower motor for improved airflow and energy efficiency

• Single-stage gas valve for straightforward, dependable operation

• Heavy-duty aluminized steel heat exchanger for long-term durability

• Quiet operation with optimized airflow design

• Compatible with both natural gas and propane (LP conversion required)

Technical Specifications

• Model: GR9S800803BN

• Heating Capacity: 80,000 BTU

• Efficiency Rating: 80% AFUE