$45,850 HVAC Upgrade Leaves Upstairs Above 80°

Homeowners in older San Diego houses should ask for a full ductwork and load plan before approving a major heating and cooling bid.

Updated on Nov. 5, 2026 in Home Renovation

Bold vector editorial illustration of a single sheet-metal duct curving through a warm plaster interior toward a brighter upper space, in coral, teal, and cream. — A San Diego homeowner paid $45,850 for an HVAC upgrade that left the upstairs of an older house above 80 degrees, prompting advice to verify ductwork before approving major bids. AI Illustration. Upload story photo >

Live Poll

Would you trust a contractor to handle a $45,000 HVAC upgrade without getting competing bids?

A San Diego homeowner paid $45,850 for an HVAC upgrade that left the upstairs of an older 4,000-square-foot house above 80 degrees. The homeowner says the replacement system performed no better than the old one.

Why it matters

A large mechanical bid can look like a guaranteed fix, but the result here shows that cost alone does not confirm that a system is sized and installed to cool the whole house. Homeowners in older homes with complex ductwork should understand how to verify performance before and after a major HVAC job.

The $45,850 bid split into $3,850 of electrical work and $42,000 for a 4-ton heat pump and ductwork changes in a 4,000-square-foot house. The homeowner reported the upstairs rising above 80 degrees after the work was completed.

The details

The contractor reworked the existing ductwork to accommodate the new heat pump, according to the homeowner's account. The homeowner received email warnings that the system was struggling to cool the house and noticed the downstairs thermostat no longer offered a heating option. The homeowner skipped competing bids because the contractor was already working on the house, and later scheduled an independent HVAC inspector and switched the system off. The homeowner also planned a backdated permit to trigger an inspector visit.

The HVAC upgrade was installed on an unspecified date, and the upstairs later exceeded 80 degrees.
The article about the failed upgrade was published on November 5, 2026.

The Home Front

Major HVAC replacements in older homes often involve reworking existing ductwork, which can determine whether a new system cools the full house. Homeowners in San Diego and across California face these same choices when an older system is replaced.

Before signing off on a large HVAC bid, ask the contractor to show the ductwork plan and the room-by-room load calculation for the new system. If a system is not cooling part of the house, contact a licensed HVAC professional for an independent inspection rather than attempting electrical or refrigerant work yourself.

The takeaway

A large price does not guarantee that a new system will cool every room, so ask for the load calculation and ductwork plan in writing before the work starts. Keep copies of permits and inspection reports with your home records.