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How To Test If Your Furnace Is Heating The Way It Should

Have you ever wondered if your furnace was working the way it should? Well, there’s a simple way to tell if it’s heating right. In this article, we’ll go over how to test your furnace’s temperature rise. We’ll also explain what the temperature rise is and what to do if it’s out of range.

What Temperature Rise Is And Setting Up To Test It

The air that leaves the furnace to heat the house is called the supply, and the air that goes back to the furnace after heating the home is called the return. You subtract the return air temperature from the supply air temperature to get the temperature rise. Each furnace has a temperature rise specified by the manufacturer that shows if it’s heating the way it should. It’ll be listed on a nameplate inside the doors of the furnace as a range of temperatures from low to high.

In order to test the temperature rise, you’ll need a probe thermometer and something to make a small hole in the metal. Then you’ll need to figure out where the return and the supply air are. Look for the arrow for airflow on your air filter. The filter should point towards the furnace. The air flowing towards the furnace from behind the filter is the return. If you follow the furnace past the heat exchanger, that’s the supply side. With that information and the range from the nameplate, you’re ready to test.

Click this link for a video going through these instructions in more detail.

How To Test The Temperature Rise

In order to run the test, you’ll need to let the furnace run for at least 10 minutes to normalize its temperature. Then you’re going to need an access hole in both the return air ductwork and the supply air ductwork. A small drill bit or metal screw should be enough so that you can pass the probe of the thermometer through. If you’ve had your system serviced, chances are the tech already made access holes.

Now it’s time to test the temperature. Stick the thermometer in the return-side hole and wait for the temperature to stop moving. Then record the result. Repeat this process for the supply side. Once you have those numbers, subtract the supply temperature from the return temperature. That's the temperature rise. With that, you can refer back to the temperature rise range to see if your furnace is within the range listed.

Click this link for 5 things you can try before you call a heating technician.
If the temperature is within that range, it should be heating right. If it’s out of range, the most common cause is restricted airflow. Dirty filters, dirty evaporator coils, or too many closed vents can all cause that kind of problem. If your temperature rise is good, but you aren’t feeling comfortable when it runs, it’s possible that your system wasn’t designed right for your home. In any case, if you have any questions about your heating system, Any Hour Services would be happy to help. You can give us a call or schedule an appointment online.
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Logo for Any Hour Electric, Plumbing, Heating & Air featuring a smiling technician with crossed arms, a stopwatch, and a bold, professional tone.

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Before we price your drains or excavation project, our expert technician will perform an in-home assessment to evaluate the tasks required. We only charge for what’s necessary—no fluff, no extra costs. This allows us to pinpoint areas where we can save you money without sacrificing quality.

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You can pay for your service with cash, check, or any major credit card. We collect, in full, upon completion of the project. If you would like to make monthly payments, we have many financing options available through 3rd party finance companies (On Approved Credit). Your technician can talk to you about your options when they give you pricing options for the work you want done.

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Our phone staff are not expert technicians, so they can’t quote prices that would be accurate to your project’s needs. A trained technician needs to see the job firsthand to give you a clear, upfront price. Quotes over the phone are a guess, and we prefer transparency over uncertainty.

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Ballpark prices can be misleading. Until we see the job, we can’t quote your final estimate accurately. Other companies may give an estimate range, but that often leads to additional costs and surprises later. Instead, we focus on giving you a fair price once a trained technician can assess the job properly.

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A: We have a small dispatch fee to send our technician to your home. They’ll arrive in a truck stocked with thousands of parts, ready to complete most jobs the same day. After a thorough evaluation, your technician will explain the issue, walk you through the recommended fix, and show you your options and final price. No hourly rates. No surprises. Just a clear, upfront price before any work begins.

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Pricing FAQ

A:

Our pricing is fair and transparent. We use a fixed-price guide that reflects the time, materials, and real costs of running a dependable home services business. No hourly rates. No inflated prices based on where you live. We focus on what it takes to get the job done—not on how much we can charge.

Before we price your plumbing job, our licensed plumber will perform an in-home assessment to evaluate the tasks required. We only charge for what’s necessary—no fluff, no extra costs. This allows us to pinpoint areas where we can save you money without sacrificing quality.

Call Now

A:

We price the job—not the clock. Hourly rates can be unpredictable, leaving you unsure of the final cost until the job is done. We believe in upfront, fixed pricing based on the work itself—not guesswork. You won’t pay for delays or mistakes, and we hold ourselves accountable to ensure there are no surprises.

Call Now

A:

We prefer to price based on the job and not what other companies charge. Hourly rates can lead to unexpected costs for homeowners, making the final price unpredictable. By pricing the work itself, we make sure you’re only paying for what’s actually needed—keeping things fair and efficient.

Call Now

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Water heater replacements vary. Often, older units require updates to meet safety standards. Common items missing from many water heaters are flexible gas lines, expansion tanks, earthquake straps, gas sediment trap, upgrade exhaust venting, etc.

For an accurate quote, one of our licensed plumbers will inspect your existing system and provide a FREE estimate.

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Our phone staff are not licensed plumbers, so they can’t quote prices that would be accurate to your project’s needs. A trained plumber needs to see the job firsthand to give you a clear, upfront price. Quotes over the phone are a guess, and we prefer transparency over uncertainty.

Call Now

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Ballpark prices can be misleading. Until we see the job, we can’t quote your final estimate accurately. Other companies may give an estimate range, but that often leads to additional costs and surprises later. Instead, we focus on giving you a fair price once a licensed plumber can assess the job properly.

Call Now

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We have a small dispatch fee to send our plumber to your home. They’ll arrive in a truck stocked with thousands of parts, ready to complete most jobs the same day. After a thorough evaluation, your plumber will explain the issue, walk you through the recommended fix, and show you your options and final price. No hourly rates. No surprises. Just a clear, upfront price before any work begins.

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Yes! We offer FREE in-home estimates for major projects like water heater installations, water softeners, and repiping—without any dispatch fee. Our licensed plumber will assess the job, explain your options, and provide a clear, fixed price. No surprises or hourly rates—just honest, reliable service. Schedule your FREE estimate today!

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No, our plumbers don’t quote a price until they have seen your plumbing project. Once they quote a price, it doesn’t change, no matter how long it takes. At any time, if you want to add more tasks to your plumbing project, your plumber will let you know how much it would cost to perform the extra work.

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You can pay for your plumbing service with cash, check, or any major credit card. We collect, in full, upon completion of the project. If you would like to make monthly payments, we do have many financing options available through 3rd party finance companies, OAC. Your plumber can talk to you about your options when they give you pricing options for the work you want completed.

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