San Francisco HVAC – Is Your Furnace Blowing Cool Air?

san francisco hvac

The San Francisco Bay Area has experienced cool temperatures in recent weeks, and they’re only forecast to get colder in the coming weeks. Is your furnace blowing air that’s cool, or even downright cold instead of warm air? There are a few factors that may be the cause – some simple, some requiring the attention of a knowledgeable heat & air contractor.

Here are a few troubleshooting tips:

First, check the thermostat setting. Is the fan running constantly, with cold air coming out of the air registers? Check to make sure your thermostat is set on “auto,” and not “on.” A constantly running fan will blow cold air – this is the first thing a technician normally checks.

Check the pilot light. If it’s out, relight it. Instructions on this task are typically located on the furnace, or in the manual. Also make sure the gas valve switch is on, and the pilot light is clean. You may need to clean the pilot light, or replace the thermocouple if you’re familiar with removal and replacement. Many homeowners feel more comfortable having a technician replace the thermocouple.

Is the flame sensor dirty? If this is the case, your furnace will cycle on and off because a dirty flame sensor results in a gas burner that won’t remain lit.

Furnace overheating. This can be a serious problem that can eventually damage the heat exchanger if your furnace constantly overheats. The simple solution? Change an air filter that’s dirty or clogged. A clogged/dirty filter results in your furnace running longer, because of blocked airflow. When the heat exchanger is affected, it can become costly as repairs are more expensive than simply replacing a filter.

Duct damage. Ducts that have holes or leaks will cause the air that comes into your home to be colder, because of the cold air coming through the holes or other damage.

If you have a newer furnace, condensate drain lines that are clogged could be to blame. Newer, high efficiency furnaces have drain lines that, when clogged, may make it impossible for the burner to light.

Furnace that’s too small or too large for your home. Having the right size furnace is essential to efficient warming. A furnace that’s too large for your needs will cycle on and off continuously, while your home never becomes as warm as you’d like; one that’s too small simply cannot heat your entire home. Unfortunately, many technicians fail to focus on proper sizing when installing a furnace.

If the furnace in your Hayward home is blowing cool or cold air and you cannot determine the problem, or it’s an issue you can’t take care of yourself, count on the San Francisco HVAC professionals at Ortiz Heating & A/C. Your comfort and energy efficiency are our top priorities!