Dust and dirt will build up in the system even if you change the return filter regularly. Duct cleaning is an important part of regular maintenance primarily for indoor air quality.
Furnace maintenance should be done every one to two years depending on your system, with duct cleaning included every three to five. Regular maintenance of all ducts and the furnace will save you a lot of headaches down the road.
A clogged dryer vent can be a fire hazard. A clogged gas dryer vent is particularly dangerous because carbon monoxide can back up into the house.
It sounds like on your ’70s home K-style aluminum gutters are just fine. They are easy to replace if damaged. An installer can run verification tests.
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