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This page of the Gas Furnace Guide contains some of the more common and frequently asked questions we answer. If you have a question that’s not listed, please use the form at the bottom of this page and ask! Names or email addressed are never shared, and your question might just get added to the page!

Three federal programs could result in the free replacement of furnaces, water heaters, and air conditioning units – if you know where to look and include the total cost of ownership in the equation. The Department of Energy oversees the Weatherization Assistance Program (WAP), which improves homes’ efficiency, lowering electric and gas costs. Furnace Replacement. The cost of replacing your old furnace or heating system to install a new one will be offset over time by the money you save with a more efficient unit. A new furnace installation performed by one of our certified professionals will help keep your house warm and cozy during the cold winter season. The cost of a gas furnace installation depends on the size you choose and the square footage in your home. If you’re switching from a different fuel source or need to have ducts installed, these factors can also affect the price. You’ll also need to choose an efficiency rating. This factor can raise the price if you go for a more efficient.

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(Last updated:10/2016)

Gas Furnace FAQ’s

Do you sell Gas Furnaces?

No, at the Gas Furnace Guide, we only help you with the buying and/or repair process.

What is a gas furnace?

A Gas furnace is a piece of HVAC equipment in both homes and business that converts natural gas or propane into heat for the space.

What is AFUE?

AFUE is an acronym for Annual Fuel Utilization Efficiency and is a measure of how well a gas furnace or heating system converts fuel into heat. To get a basic understanding of the gas furnace rating, you could use a money analogy.

An 80AFUE furnace converts .80 cents of every dollar spent on fuel (Gas) to heat.
A 93AFUE furnace converts .93 cents of every dollar spent on fuel (Natural Gas or Liquid Propane) into heat.

How does a gas furnace work?

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This is a very complicated answer, since different furnaces work in different ways. Basically however…a gas furnace converts fuel like natural gas or liquid propane into a flame that heats up a heat exchanger. When it reaches a manufacturer setpoint, a blower built into the furnace starts up and blows air across the outside of the heat exchanger. This process heats up the air before it is distributed through the ducting system.

Can I install my own gas furnace?

Installing a furnace is a detailed and technical process that requires several specialized tools for working with sheet metal. That said… If you can swap a car transmission, or replace the engine on your lawn mower, you can probably install your own furnace.

Disclaimer: Improper installation of a gas furnace CAN KILL YOU! Working with natural gas usually requires a license in most states. In addition, most states or municipalities require permits and inspections to replace or install a gas furnace. It is our recommendation that you always use a trained and licensed professional to install your furnace!

Can I buy a gas furnace online?

In some cases you can find a furnace and buy it online at places like eBay or Amazon. Due diligence should be exhausted to the extreme! Buying a gas furnace online and installing it yourself or having a friend help, comes with great risk.

Before you do buy it online, make sure you speak directly to the furnace manufacturer about their warranty for online purchases. Many do not cover internet purchases, regardless of what the seller tells you. Learn more about the dangers of buying a furnace online.

How do you clean a gas furnace?

There are two types of cleaning for your gas furnace. Basic and surface cleaning, and then a contractor style cleaning.

Basic Cleaning –

Turn off the breaker to the furnace
Take a moist washcloth and wipe down the entire exterior surface of the furnace. This will keep the unit free of dirt and other foreign objects that could attract moisture and cause the casing to rust prematurely.
Open the front panel of the furnace and using a shop vac, clean out any dust or debris inside the unit.
Inspect the unit for corrosion, water, or any other odd things that look as if they do not belong and clean them.
Remove the furnace filter from the base of the unit and replace with a fresh filter.
Vacuum out the furnace filter housing.

Contractor Furnace Cleaning –

A contractor will handle the rest from here! Most will:

Clean and inspect ignitor
Clean and inspect gas valve
Clean and inspect the burners
Clean and inspect the duct attached to the furnace

Gas Furnace Guide recommends that everyone with a gas furnace have a seasonal maintenance contract to have the furnace serviced every year before the heating season. Contact a local contractor to set yours up today!

How big of a gas furnace do I need?

The size of a gas furnace you need is very different for each home, where you live, and several other important factors! In fact two identical size homes in the same town can use two completely different sized gas furnace!

The only true way to properly size a furnace is with a heat load calculation. In most cases, you should simply ask your hvac contractor to include the load calculation as part of their estimate.

We also added a guide on how to determine what size furnace you need.

Is a load calculation required to buy a gas furnace?

All reputable contractors will perform a load calculation on your home before recommending a furnace size!Some states DO REQUIRE a load test to be included in order to get a permit and inspection. Companies who regularly perform a load calculation are considered more professional than their counterparts and tend to know more about what they are doing as it relates to your heating needs.

That said, many others will skip over the heat load and simply replace your furnace with a similar sized unit.

Is it hard to repair a gas furnace?

Repairing a part on a furnace is actually fairly easy and a simple mechanical process.

Diagnosing the problem and troubleshooting can take years of experience and training.

How much does a gas furnace weigh?

Gas furnaces weigh between 75-250 pounds. The variance is related to the quality, size, type, efficiency and features your furnace has built into it.

Can I paint my gas furnace?

Yes. You can paint the outer surfaces of your gas furnace.

Why is my gas furnace leaking water?

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In most cases, if you also have an air conditioner system, it is the evaporator coil, or cooling system that is leaking condensate water. Call a professional to inspect and diagnose why the furnace is leaking. If you have a higher efficiency condensing furnace (90or higher AFUE) water is the natural by-product of the cleaner burning systems. The exhaust or flue on these furnaces is made from PVC pipe and tends to build up a bit of moisture while running.

How often does my gas furnace need to be cleaned?

At least once each year by a professional. Many manufacturers will require this in order to keep the warranty intact.

How much does a gas furnace cost?

Gas furnaces can range from $400 for low end, low btu units, to more than $3000 for high end communicating furnaces by the high-end of the quality scale like Carrier furnaces or Trane gas furnaces.

Factors affecting the price of a gas furnace:

Size of furnace