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Planning a Rooftop Unit Replacement for Your Business

Assessment, permits, the crane day and timing: replacing a rooftop unit without closing the business.

November 8, 2026

Replacing a rooftop unit (RTU) is a bigger job than a home system, with a crane, permits and a building that may need to stay open. Planning ahead keeps it to a day of disruption.

1. Assessment

We look at the existing unit, the curb it sits on, the ductwork, the electrical and gas, and what the space needs now. A tenant change or new equipment inside may mean the old size is no longer right.

2. Matching the curb

A new unit often has a different footprint. It may fit the existing curb, need an adapter curb, or need a new one, which affects the roof work and the price.

3. Permits and lead time

Commercial replacements need permits, and some units have long lead times. Starting before the old unit fails gives you choices.

4. The crane day

The old unit comes off and the new one goes on in one lift, usually early in the day. We plan the crane, the street or lot space, and the timing around your hours.

5. Start-up and testing

Once it's connected, the unit is started, tested and checked, including the commercial acceptance testing California requires on many jobs. See acceptance testing.

Plan before it fails

An older unit with repeated repairs is worth planning around now, in the off-season, rather than after it quits in a heat wave. To start, send us a message or call 805-965-6326.

Related

More tips on commercial, costs & permits.

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Or call 805-965-6326 (Mon–Fri 8:00 AM – 4:30 PM), or email service@crockerair.com.