We didn't want to be in the cleaning business but after trying all the usual suspects we were still getting poor results. This was a major problem with new housing and drywall dust. Manufacturers do not like honoring warranty when a furnace is filled with drywall dust. A bunch of specialized training and trucks later we do our own. Unfortunately (or fortunately for us) we are booking well into January for duct cleaning.
As far as the furnace and/or AC is concerned you folks should be hiring tradesmen rather than cleaners to service your units. It's like taking your car to the car wash and expecting it to run better. Your best case scenario is if the cleaner didn't damage the equipment. We get lots of service calls cleaning up after cleaners.
A qualified technician can often identify problems and have them addressed for less cost before they leave you with a no heat situation. A service call during overtime hours can be outrageous not to mention the inconvenience. If you miss a day or two of work, add that to the bottom line. Most people also do not realize that parts on most furnaces are covered for 10 years if you have a newer unit. Things like flame sensors etc. are generally replaced as part of a quality maintenance.
The majority of our customers enter into a service contract that looks after annual maintenance. Your furnace is serviced in the off season at a significant discount. You can go into the heating or cooling season with confidence knowing your equipment is in good working order. Unfortunately customers waiting until late fall or summer pay more. They also have to be patient to book a qualified technician.
Contrary to the doom and gloom we hear daily, qualified employees are hard to find and demand is very high for all trades. All reputable companies are extremely busy so please be patient when calling around.
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