Start from what's actually wrong
Ductwork sized for 1950s-70s equipment standards doesn't always move enough air for a modern system, so indoor-air planning in Sterling Heights often starts by checking whether the original runs are still adequate.
A written scope should spell out
- The existing condition and probable cause
- Prep and protection for the rest of the house
- Material and equipment compatibility
- Permit filing, testing, cleanup, and restoration
- Exclusions, warranty terms, and the change-order process
Sterling Heights context
Original ductwork in Sterling Heights' 1950s-70s ranch and split-level homes was sized for that era's equipment, so duct leakage and undersized returns are common findings when a system is upgraded decades later.