They provide you with HEPA air filter changes and cover everything else including the regular ductwork cleaning.
When my wife and I first moved in together, I was surprised about how strict she was about keeping the house impeccably clean and staying up with all the HVAC system maintenance. She even insisted that we have the ductwork cleaned once per year which I thought was overkill. I always thought you could have the ductwork cleaned once per 7 years depending on what air filters you use and if you have pets. If you had pets, I would say clean the ductwork every other year to be safe. Well, we don’t have pets so I don’t know why she pushes for us to cover all this expensive maintenance. I do have to admit though, I’ve never enjoyed such fine air quality in my home and I suppose that’s because of her insisting on all this HVAC maintenance. We finally decided to enroll into an HVAC service plan to save some money. When she saw the extra HVAC service plan, she wanted to go for that. They provide you with HEPA air filter changes and cover everything else including the regular ductwork cleaning. Ever since we decided to go with this service plan, we have been saving a small fortune. She’s happy about saving the money but says we should save it up to get something really nice like radiant heated floors. I know that when she suggests something like that, there will likely be no choice in the matter. I could argue for getting something else like a geothermal heat pump, but she would ultimately say we need to go for what she wants.