When your house is always cold, there are several possible explanations. Here are some things that you can check as the source of the problem.
One of the best case scenarios is that the issue lies with your thermostat. It could just be that your thermostat is located in a bad place. Maybe it's got some natural light hitting it and warming up the thermostat; that would cause the system to shut off before your home has reached a good temperature. The same thing goes if your thermostat is located very close to a heating vent. You could try shutting off vents and blocking out direct sunlight sources or relocating your thermostat.
The thermostat might also just be crooked. If you have a thermostat that relies on mercury levels to tell the temperature, a crooked thermostat might tilt the mercury level and make your thermostat think it's warmer than it really is in your home.
But sometimes thermostats can simply break. If your thermostat isn't getting a correct reading and you've tried the fixes above, it may be time to replace it. And even if your thermostat has the correct temperature reading, it might not communicate with your heating system correctly; your heating repair specialist can deal with both of these issues during an inspection.
Heating Repair Is Needed
Furnace repair can range from minimally expensive to very expensive. Something small, such as a clogged filter, could be the cause of your heating troubles. If heated air can't get through your HVAC system, it can't heat your home. Trapped air is also a fire hazard, so make sure to get those filters changed on a regular basis.
Another common problem with heating is the combustion chamber. If it hasn't been cleaned in a while, then the fuel that enters your furnace is not going to be used correctly. Your thermostat might be telling the heater to kick on, but if it doesn't have enough combustion power, it will never get to the right temperature.
The pilot light is another thing that you can check easily. Look to see if the pilot light is disengaged or simply weak. Either of these issues will lead to a furnace repair.
Many other problems with your furnace can cause heating malfunctions, so get a specialist out to your home if you can't easily locate the problem yourself. You may be able to make repairs, or you may need to consider an additional heating system installation, such as a heat pump installation, to supplement a failing heat source.