It is fairly common for a heating or cooling system to have a strange odor the first time you turn it on after it has been off for some time. However, if there are odors coming from your system on a regular basis, it may be a sign that you need your HVAC system serviced or repaired. Depending on the type of odor, it can give a clue to what might be the cause.
Electrical Or Burning Odors
The most common reason you may smell a distinct electrical odor is if your filter is clogged. You should check your filter to see if it needs to be cleaned or replaced. If the filter is in good condition, then there most likely are other parts within the system that are overheating, such as the blower motor, bearings or electrical connections or relays. It is best to turn the system off, at the breaker if possible, and call a service professional.
Gas Odors
The most alarming odor you may smell from your heating system is the smell of gas. If you think it may be a gas leak, open a window or door and remove everyone from the house immediately. However, most leaks will be at the equipment or from the pipes. If the smell is coming from your vents, sometimes it is just dust that is burning off that smells like gas. Regardless, always take the smell of gas seriously.
Musty Odors
Probably the most common odor issues people complain about is a musty or damp smell coming from their vents. Although the smell usually will mean that there is water or damp areas in the house, it rarely is a problem with the heating or cooling system itself.
Whenever there is a strange odor, it is best to have your service professional come and take a look to make sure there is no serious danger. They can diagnose the problem and let you know what needs to be done to get it fixed.
