Keeprite furnace maintenance and inspection Furnace is working safely and efficiently and in great condition at this time. Found no problems or concerns with the unit during visit. Furnace had been struggling the day before the service call. Found error codes stored in board indicating furnace was shutting down on high limit trips. Old filter was installed a little too long and restricting too much air. Recommend changing those merv 13s every 2 months instead of every 3. Attached PureAirX electronic air cleaner quote. Price includes metal frame and a years supply of filters.