Upon arrival performed a three system maintenance and when I finished found out that there was one more unit. Performed a four system maintenance checking heat. Checked all electrical, mechanical and safety components. Cleaned flame sensors, checked filters, checked amp draws, capacitors. Found that all filters need to be replaced. Found that the heat strips had failed on master unit, heat strips will have to be replaced, system only using heat pump for heat in master. Janet approved cleaning of 1in filter for master. Sent estimate over to replace heat kit and replace filters. Also there is a boot upstairs in one of the guest bedrooms that has the insulation deteriorating and is being blown out onto the bed. Boot is a 16x8x8.