New heat pump owners often notice that the air coming out of the vents isn't as warm as when they had a gas furnace. Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F.

The most common problems that cause a lack of airflow include frozen coils, broken fan and restricted airflow due to dirty air filters or vent obstruction. However, there are many other issues that can lead to minimal airflow, so it may be necessary to ask the professionals.

Two of the most common reasons your home central heating isn't working are a dirty flame sensor and a dirty air filter. Clean the flame sensor with a steel wool pad and replace the air filter every 1-2 months. This will help prevent future problems.

It needs to be set to heat mode – if it has been accidentally set to cool, you get no heat. Also, check the fan settings, as errors here often produce a situation where the heating system appears to be running, but only cold air comes from vents.