Complete 2 system furnace repair and preventative maintenance check. Found upstairs system 15 years old. Heating good but blower wheel is dirty which is causing stress on the motor and decreasing the air flow in the house. Needs to be pulled and cleaned. Both systems need secondary water safety switch to prevent water from going into system and onto drain pan when drain line clogs. Both systems have standard one in filter which is allowing smaller dust particles to pass through and collect on blower wheels decreasing the air flow. Systems need electro static filter to prevent dust build up and keep systems and house cleaner longer. Systems also have signs of mold growing on and inside system. Need UV inhibitor installed in systems to kill bacteria mold allergens and odors in house that are causing harm to residents.