My mom called myself and others last Tuesday, because she thought a rodent was inside of the HVAC duct. I told my mom that it was unlikely, although she insisted that I come over after labor to check it out! When I arrived, I started looking at the heat pump and the HVAC duct. I used a really bright flashlight to see inside of the HVAC duct. I saw no evidence of rats or mice. I did not even see any evidence of bugs prefer cockroaches, termites, or ants… My mom told myself and others about a loud sound that she kept hearing at night. When she started to describe the sound, I did not think it seemed prefer a HVAC duct problem at all. I believed it sounded prefer an issue with a heat pump, and unfortunately, heat pumps and electricity are not my area of knowledge. I could have helped my mom with a pest control problem, but I did not know the first thing about the heat pump. I knew it was best to leave the labor to a professional and certified expert. I found a local heating supplier that offers free estimates and I provided them a call for my mom. Waited until the service service arrived so I could find out what they thought about the problem. They agreed that the sounds were likely coming from the heat pump and not the HVAC duct. They performed a full plan service tune up that included cleaning all of the electrical and mechanical parts of the system, then hopefully the plan will run better now that it has been inspected and cleaned.