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Why is My Furnace Not Heating the House?

2 HVAC employees standing on and by staircase

“I need HVAC help right away! Why is my furnace not heating the house?


Why is my furnace not heating the house? Several things could be causing your furnace to malfunction. Typically, it is a result of some kind of damage.

Clogged air filters can restrict airflow, making it difficult for your heater to circulate hot air.

A malfunctioning thermostat could also be the culprit. A damaged thermostat makes it difficult to sense temperature correctly, which could be telling your furnace to shut down too early.

Your furnace could be short-cycling. “Short-cycling” forces your furnace to stop the heating process before it is finished. This is a symptom of severe furnace damage, and you’ll need to call an HVAC professional right away before the problem becomes worse.

An HVAC technician explains to a homeowner why his furnace has not been heating his house.

Why Is My Furnace Not Heating The House? – Falling Star Heating And Cooling

Help! Why is my furnace not heating the house anymore? You’d be surprised how many times we get asked this question. Surprisingly, it’s a pretty common problem. If your heater has suddenly stopped heating your home evenly, then it could be any number of problems. Most of these problems are symptoms of a damaged furnace that is in need of repair. If you experience any of the problems that we talk about in this blog post, then you’ll need to have your furnace inspected by an HVAC professional as soon as possible.

New around here? Welcome! We’re a team of HVAC professionals based in Colorado Springs, and we love educating people about their HVAC units. Our mission is to make HVAC education more accessible to everyone. So, in this blog post, we’ll answer the question that we get asked all the time: why is my furnace not heating the house? Then, we’ll tell you how you can get your furnace inspected and diagnosed by an HVAC professional for free!

Why is my furnace not heating the house anymore?

So, why is my furnace not heating the house evenly? Is it damaged? Will I need to have it replaced? Or can I get it repaired? 

Several things could be causing your furnace to malfunction, including:

A clogged air filter. Your furnace has an air filter that must be changed regularly. If the filter is neglected, pollutants can build up on it, eventually causing a blockage. If your air filter is clogged, your furnace won’t be able to push out hot air evenly. This is a relatively easy fix. You can either change the filter yourself or call an HVAC professional to handle it for you.

A malfunctioning thermostat. If your furnace’s thermostat isn’t working properly, then it’s not reading temperatures correctly. You may need to have your thermostat re-calibrated by an HVAC professional.

A short-cycling furnace. Short-cycling is a symptom of serious furnace damage. It causes your furnace to shut down before it has completed its heating process. If your furnace is short-cycling, then you’ll need to contact an HVAC professional right away. If left untreated, a short-cycling furnace can break down completely and will need to be replaced.

Two guys are smiling near furnace after the HVAC technician has repaired his heating system.

Get your furnace inspected by an HVAC professional for free!

If you’ve been wondering why my furnace is not heating the house anymore, then chances are, your furnace has been damaged for a while now. The best course of action would be to have it inspected and treated by an HVAC professional. Otherwise, you could have a pricey furnace replacement in the future!

That’s where we can help. As we mentioned before, we’re a team of HVAC professionals in Colorado Springs. If you’re a Colorado homeowner or business owner, then we’d be happy to inspect and diagnose your furnace for free! Learn more about our heating services, and request your free furnace inspection today!

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Falling Star is staffed by the kind of guys you probably see at church, shopping for food, or hanging out at high school football games (Let’s Go Palmer High Terrors!). They’re just ordinary people who love their families, community, and making a positive difference.


Falling Star Heating and Cooling is here to provide the comprehensive Prairie Park HVAC support you deserve. Schedule your free consultation and start the conversation to solve any problem, especially emergencies.