Your furnace may have a permanent filter, or a disposable filter. If you have a permanent filter then you will need to clean it the way that the manufacturer recommends. A disposable filter needs to be replaces, which is quite easy. Either way, you need to know how to get into your furnace and get to your filter. Before doing any type of maintenance to your furnace, you should turn the power off to the furnace. Do this at your circuit breaker box. Now go to the furnace and open up the cover in the front of it. You will need to look for a door or compartment marked 'filter'.

carrier homes heating furnace filters - Holmes Heating - Heating, ventilation, air conditioning and duct work services. Company, products,service information, financing, plus sales call and maintenance schedulers.