Do you have the screens to keep some of the larger nest-building bugs out? My uncle tells his horror story of the furnace refusing to run. The shop discovered dirt-dauber nests blocking the airflow. Here in TX those little buggers are everywhere and just love those little out-of-the-way places to set up housekeeping. He now has screens on the furnace, water heater and fridge - as do I.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks