Commercial HVAC replacement and installation in Burbank.

Most buildings drift into the first option without ever choosing it. A unit runs until it stops cooling, and then the decision gets made in a heat wave with whatever is available. That is the most expensive version of this project, because you lose the ability to shop equipment, schedule the crane around your tenants, or take a rebate that requires approval before the work starts.

The other two paths are decisions you make on your own calendar. A planned like-for-like swap is right when the space is used the way it was designed and the current unit basically keeps up. A planned upgrade is right when bills have crept, comfort complaints never really resolved, or you have a portfolio-level decision to make about gas heat. The high-efficiency specification that reshaped this equipment market cuts unit energy use by up to half against the older baseline, so the upgrade case is real money rather than a talking point.

Two quotes for the same roof can differ by a wide margin and both be honest. The difference is almost always sitting in these lines. Ask which ones your quote carries and which ones are excluded, because exclusions are where change orders come from.

The equipment is the part buyers compare, and it is the part that varies least. Two contractors quoting the same tonnage and the same efficiency tier are quoting nearly the same box. What separates their numbers is the install: who owns the rigging plan, who pulls the permits, who handles controls integration, and who comes back when the north side of the building is warm in month two.

So the useful comparison is not price per ton. It is scope per dollar. A quote that looks low usually got there by leaving something out — the curb adapter, the structural check, the crane, the commissioning, or the permit and inspection time. None of those items disappear. They reappear later as a change order, at a worse moment, with less leverage on your side of the table.

Rooftop units condition close to half of all commercial floor space in the country. This is a well-worn project with well-understood costs, not a custom engineering exercise. Anyone who cannot tell you what their number covers, line by line, is either guessing or hoping you will not ask. Ask for the exclusions list before you ask for a discount.

Before you budget, work out which version of this project you actually have. The gap between the two is weeks of schedule and a meaningful share of the price, and you can usually tell from the roof and the electrical room in a single visit.

A quote written from a nameplate photo is a starting number, not a price. The nameplate tells you what somebody installed twenty years ago. It does not tell you whether that sizing was ever correct, whether the roof still carries the load comfortably, or whether the building's electrical service has room for what you want next.

A proper walk covers five things. The load, calculated from how the space is used today — occupancy, plug loads, lighting, envelope, operating hours. The curb and the structure underneath it. The electrical capacity at the panel, which is the most common surprise on any project that adds tonnage or drops gas heat. The physical constraints: crane reach, staging space, roof access, and whatever is in the way. And the gas service, whether it is staying or going.

Those five categories decide whether an electric option is even on the table for your building. They are also the five that quietly turn a clean quote into a change order when nobody checked. Half a day on site is cheap insurance against a number that moves after you have signed.

Two local realities shape a Burbank replacement. The first is permitting. In California, mechanical work like a rooftop unit replacement is permitted work — and so is re-roofing. If the roof is within a few years of its own replacement, sequencing the two jobs together saves a second crane mobilization and a second round of roof penetrations. Decide that before you order equipment, not after it lands.

The second is climate. Heat pump rooftop units lose efficiency as outdoor temperatures fall, which is why they suit mild-to-moderate winter heating best. Across most of the U.S. South and West, today's heat pump rooftop units can carry most or all of the winter heating load on their own. Southern California sits squarely in that band, so an all-electric replacement here is a genuine option rather than a compromise you tolerate.

A rooftop replacement is a fifteen-to-twenty-five-year decision usually made in about two weeks. Price gets all the attention, but two other questions decide whether you are still happy with it in year three.

The first is who owns the asset and who owns the bill. In a leased building, the lease language on capital equipment decides whether this is your project or the landlord's, and whether an efficiency upgrade you fund shows up on your utility statement or on theirs. Settle that before you spec the unit, because it changes which option is worth the premium.

The second is what happens after handoff. Refrigerant work on both the old unit and the new one is regulated: certified technicians, documented recovery, no venting. That obligation does not end at commissioning. It follows the equipment for its whole service life, which is worth planning across a fleet rather than one roof at a time.

If you own more than one unit, the highest-value move is not picking a better box. It is getting ahead of the failure curve. More than two hundred organizations have run planned rooftop upgrade programs across more than forty-three thousand units, and the combined result was thirty-seven million dollars a year off their energy bills. That did not come from emergency replacements. It came from replacing units before they quit, on a schedule, with time to shop.

The practical version for a single building is simple. Inventory every unit with its age, tonnage, and refrigerant. Rank them by age and by how much trouble each one has caused. Replace the worst one this year on your terms, and put the next two into the following budget cycles. Anything past fifteen years is a candidate rather than an emergency — but treat it as a candidate now, while you still control the timing and the price.

The alternative is a phone call in August and a multi-week lead time on the only unit that fits your curb.

If two quotes do not both show these five items, you are not comparing them — you are guessing at the difference. Ask for all five in writing before any equipment is ordered.