Annual, Preventive, Regular Maintenance No matter what you call it, boilers, furnaces, AC units, and water heaters need to be tune-up periodically to ensure that they deliver their max performance. Now this has to be just a scam from the heating companies to get more money, my heating system has been running fine for years, why should I have some clean it? The jury may be out for how regularly you should schedule maintenance but the general guideline is once a year. Why you ask, well because your heating system collects dirt, dust and other particles that build up and lower your system efficiency. Making older system even less efficient and making new energy efficient systems seem much less modern. You might still wonder, does it really make a difference, well we are lucky enough to have a testimonial that shows the benefits of annual maintenance. This past winter was on average 15% colder than the previous year's winter, if you ran the same year to year you would use 15