It is a great idea to change out your filter every 4 to 6 months. If you have hairy animals, smoke in the house, keep your windows or doors open often, and if you see dust accumulating on the filter you should change it sooner. It is always a good idea to check on the filter and see if you need it to be changed.
As tempting as it is to make this area a storage space for our holiday decorations or clothing that our children have out grown, but it is not a safe idea! The furnace or water heater is powered by electricity or fossil fuels such as oil, propane or natural gas so it is best to keep it well ventilated to ensure your families safety!
Before calling a technician out to service a unit verify/check power to furnace. Do that by switching the fan on. Blower should come on and that will show you that there is power. Check to make sure the door is tightly closed as well. If it does not come on then proceed with making an appointment.
It is a great idea to have a scheduled maintenance plan on your furnace and air conditioner. This will insure that the sensors, safeties, ignitor, pressure switch, and all the electronic controls are reading properly. With the new generation of furnaces the electronics have very precise millivolt reading. It can cause safeties to trip and no longer allow the furnace to come on. With an annual maintenance plan you can be assured of a safe and properly running furnace by keeping up with the service and performance.