Unusual Cycles
Another red flag is if your furnace suddenly starts to cycle differently. This can be difficult to pinpoint if you don’t pay attention to how your furnace operates. It’s a good idea to monitor furnace operation purposefully at least once a month. Time heating cycles for an hour or so to make sure they are consistent.
If heating cycles are turning on and off every couple of minutes, something is wrong. The same is true if your furnace is turning on and staying on consistently for longer than 10 to 15 minutes at a time. When this happens, your furnace may be struggling to keep up with warming your home to the thermostat settings you have selected.
Lack of Maintenance
When was the last time you scheduled maintenance for your furnace? If it has been longer than a year or you don’t even know if and when you’ve had professional maintenance for your unit, that’s a big indicator that it’s time to put some love into it.
Your furnace will only work well if it receives the care that it needs. It’s completely normal for your furnace to age and wear out as time passes. Investing in professional care can help slow down that aging process so your furnace can maintain efficiency for longer.