As the winter season rolls around, homeowners kick their furnaces into full gear to keep low temperatures from penetrating interior spaces. Nothing is more bothersome than expecting a warm airflow to be greeted by a rush of cold wind. 

Most homeowners who experience this issue will quickly replace their heating system with a new one—though it isn’t always necessary. When your furnace blows cold air into your home, it’s best to evaluate the problem rather than pay for a replacement you might not need. If you’re experiencing this problem, below are a few reasons your furnace isn’t functioning how it should. 

– Thermostat Issues

Thermostats control furnace heat. If they are dysfunctional, it’s virtually impossible to achieve your desired heat level. If you’re noticing a haywire thermostat, you might be dealing with build-up. A clogged, dusty thermostat causes heat transmission issues because of blocked vents. In some cases, dirt and debris can also cause gauge issues. 

The solution to a dirty thermostat is simple. Dip a soft microfiber cloth into cold water, wiping dirt away from your thermostat. Avoid pouring water directly onto the device. 

– Poor Installation of Heating System

Furnaces are more prone to system issues than most other home appliances. If your thermostat was incorrectly installed, to begin with, it isn’t going to provide heat well. 

Confirm with your local heating repair services that your thermostat is well-located. Check for any loose wires. In the event of a re-installation, limit the number of household members who can interact with the thermostat. Keep inexperienced persons and children from handling the thermostat. 

– Incorrect Settings

Thermostats aren’t sophisticated devices. While they might come equipped with several buttons, using them is relatively intuitive. Yet, many will fail to consult their user manual, thinking all they need to know about are the on, off, and auto buttons. 

If you’re only turning your furnace on, you might not be aware of it running without providing warm air. Instead of using the on mode, use auto mode. Unless your thermostat is experiencing other underlying problems, it should begin to blow hot air into your space. Switch back to on mode when you achieve the optimal temperature in your home. 

– Older, Dysfunctional Thermostat

Compared to their newer counterparts, older thermostats tend to encounter many operational problems. If you’ve been using your thermostat for over a decade, that could be the reason why it’s blowing cold air into your home.  

The best way to deal with an older thermostat is to replace it. Equip your home with a  smart thermostat that automates heating and ventilation. You can easily control a smart thermostat with your mobile phone or similar device and even review your monthly bill. 

Choose a compatible thermostat with an auto-adjustment setting. Work with an expert to select the most appropriate thermostat for your home. 


Your checklist shouldn’t only include streamers, trees, and delectable dinners when preparing for the holiday season. Prepare your furnace well in advance to avoid heating problems and enjoy a warm Christmas. 

If you’re experiencing cold or forced air heating problems, don’t hesitate to give our experts at Capital Plumbing and Heating a call. We prioritize comfort and satisfaction and are dedicated to working with trusted manufacturers and suppliers.