The HVAC zone control at my house had started having issues.
It would be on for a while all of a sudden go off, then using the temperature control the unit would come back on.
It was behaving intermittently. I had been referred to one of the best HVAC techs in the state that I contacted to come and have a look at the unit. Upon inspecting the unit, the HVAC professional determined that the intermittency was from clogged HVAC ducts. The vents were clogged with dirt and all sorts of debris and this was limiting airflow through the vents. It caused the air purifier to strain, thus using more energy and it became intermittent. The HVAC installation had been done like five years ago. The HVAC provider went to work executing air duct cleaning to remove the clog that was in the vents. The serviceman was very helpful and he would explain each step to me so as to keep me informed. It also showed his expertise. The air quality systems were back to functioning optimally and the air quality was significantly increased. The serviceman also performed a thorough tune-up on the central unit and replaced some of the components that were worn out. After the expert was done, he provided me with a homeowner solutions pamphlet that indicated the steps to take in order to maintain the air purification systems which included duct cleaning after every one to two years. After we were done with the job, I invited my technician to a cup of tea as it was raining outside. He was very appreciative as it also gave him a chance to relax for a while before calling it a day.