Rooftop package units on a Houston commercial building serviced by Castle AC and Heating

Commercial HVAC Services in Houston: Repair, Installation & Maintenance

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Castle Air Conditioning & Heating installs, replaces, repairs and maintains commercial HVAC across the Houston area: rooftop units, packaged systems, commercial split systems and dedicated server-room cooling. We work on all makes and models, not only the brands we sell. For a commercial call during business hours, same-day service is realistic, and we will come out after hours so a business does not lose a day of trade. For a business the number that matters is not the repair bill. It is how many trading hours you lose, and that is what we plan the work around.

Call or text (713) 667-7606

Tell us what has failed and what it is costing you, and we will give you a realistic time before you hang up.

Commercial HVAC repair and emergency service

When a rooftop unit fails at a restaurant in July, the problem is not comfort. It is a dining room you cannot seat, stock you cannot keep, and staff you are still paying. Commercial repair is a different job from residential repair because the cost of being down is so much higher than the cost of the fix.

We diagnose and repair commercial equipment of all makes and models across Houston, including warranty work. Our technicians are NATE-certified and we are licensed under TACLA #00051749C.

How quickly we get there

For a commercial call during normal business hours, same day is realistic. We treat a business that is losing trading hours as urgent and we make every effort to get there fast.

Tell us what has failed and what it is costing you when you call, and we will give you a realistic time before you hang up. For a business, a time you can plan around is worth more than an optimistic one, so we would rather commit to a window we can hold than to a number that sounds better on the phone.

Working outside your trading hours

Some commercial work should not happen while you are open. A changeout at a retail unit or a restaurant is easier for everyone in the evening or overnight, and it costs you nothing in lost trade.

We will schedule planned work around your opening hours, and we will come out after hours for a breakdown, precisely so a business does not lose a day of trading. Out-of-hours work carries a premium. We will tell you what it is before anyone is dispatched, not after the work is finished.

Commercial HVAC installation and replacement

We replace rooftop units, packaged systems, commercial splits and dedicated server-room cooling across Houston and Fort Bend County. The short version: we size the system to the building as it is used today rather than copying what came off the roof, and we plan the crane lift, the curb and the electrical before quoting rather than on the day.

Replacement is a bigger conversation than repair, so it has its own page. See commercial HVAC installation and replacement for what drives the scope, how we phase the work so you do not have to close, and what the refrigerant change means for your timing.

Commercial heating repair and replacement

Houston winters are short, which is exactly why commercial heating gets neglected until the first hard cold snap, when every building in the city wants a technician on the same morning. Commercial heating replacement is far easier to plan in September than to arrange in January.

We repair and replace commercial heating equipment: gas furnaces, rooftop units with integrated heat, and heat pumps. If your building runs a package unit, the heating and the cooling are the same box, so the sensible time to think about heating is when the cooling side is already due for attention.

The same applies to light-commercial buildings, which often run equipment closer to residential in size but on commercial hours. We handle both.

The businesses we look after

Restaurants and food service

Kitchens push HVAC harder than any other commercial space: heat load, grease, make-up air, and a dining room that has to stay comfortable through all of it. Downtime here is measured in covers, so when we do the work matters as much as the repair itself.

Retail and offices

Comfort is part of how long people stay and how they feel about the place. In offices, the complaint we hear most is uneven cooling between zones, and it is usually solvable without replacing the system.

Hotels and hospitality

Guest rooms, lobbies and back of house all behave differently, and a complaint about a room that will not cool goes straight into a review. Hotel HVAC servicing has to be scheduled around occupancy rather than around us.

Churches, schools and non-profits

Buildings that are full on some days and empty on others, often with older equipment and a committee approving the spend. We are used to quoting in a way a board can actually read and compare.

Warehouses and light industrial

Large volumes, high ceilings, and equipment that has to keep running. Often the real question is whether to cool the whole space or only the parts where people work.

Commercial maintenance agreements

Commercial systems move far more air than a home system and run far longer hours, so they need inspecting more often. We recommend quarterly maintenance on commercial equipment, rather than the twice a year we recommend for houses. We have also written up nine ways a business can keep its commercial HVAC in good repair between visits.

Our Set It and Forget It Assurance Plan pre-schedules those visits, and the system reminds you automatically when one is due, so nobody has to remember to book them. Commercial agreements are billed per visit rather than as a single up-front fee, which keeps the cost tied to the work actually carried out on your building.

Full details are on our maintenance plans page, and our Houston maintenance schedule explains what each visit covers and why the timing matters in this climate.

What to look for in commercial HVAC companies in Houston

Most HVAC for business is bought in a hurry, which is how buildings end up with equipment nobody can service and quotes nobody can compare. Four questions are worth asking whoever you call: are they licensed and insured for commercial work, will they service equipment they did not install, will they put the quote in a form your finance people can read, and can they work around your trading hours.

Why Houston businesses use Castle

Family owned and working in southwest Houston for decades
TACLA #00051749C, licensed and insured
NATE-certified technicians
American Standard Customer Care Dealer, and we service all makes and models
Same-day service during business hours, and after-hours call-outs so you do not lose a trading day
We do not buy radio or television advertising, so that cost is not built into your quote
4.9 stars from 200 Google reviews

We serve Houston, Fulshear, Katy, Sugar Land, Richmond, Bellaire, West University Place, Pearland, Seabrook, Webster, League City and Friendswood.

Frequently asked questions

How quickly can you get to a commercial breakdown?

During normal business hours, same day is realistic. We treat a business losing trading hours as urgent and make every effort to get there fast. Tell us what has failed and what it is costing you, and we will give you a time you can plan around before you hang up.

Can you work outside our opening hours?

Yes. We will schedule planned work around your trading hours, and we will come out after hours for a breakdown so you do not lose a day of trade. Out-of-hours work carries a premium, which we quote before anyone is dispatched.

Do you work on commercial equipment you did not install?

Yes. We service and repair all makes and models of commercial HVAC, including warranty work, whoever originally fitted it.

How often should commercial HVAC be serviced?

We recommend quarterly for commercial equipment. Commercial systems move a great deal more air than a home system, run longer hours, and are usually harder to get to once something has gone wrong.

How does a commercial maintenance agreement work?

We pre-schedule quarterly visits and the system reminds you automatically when one is due. Commercial agreements are billed per visit rather than as a single up-front fee, so what you pay stays tied to the work carried out on your building.

Do you handle rooftop units and crane lifts?

Yes. Rooftop units are the equipment we see most in Houston commercial buildings, and we arrange crane access where a unit cannot be moved any other way.

Can you cool a server room separately from the rest of the building?

Yes. A dedicated mini-split lets a server room or comms cabinet stay cool when the main system is off, which is the usual reason equipment overheats out of hours.

Is it worth repairing a commercial unit, or should we replace it?

It depends on the age of the equipment, what has failed, and how much longer you plan to be in the building. We will tell you when a repair is the better spend, and we will tell you when it is not.

Do you charge to come out and diagnose the fault?

Yes, like almost every company we charge a diagnostic fee. It covers a technician driving out and properly testing the system rather than guessing. The diagnostic is billed separately from the repair itself.

How do we get a quote?

Call or text (713) 667-7606, or request an estimate online. For commercial work we will normally want to see the equipment and the access before quoting, because both change the job.

Request an estimate for your commercial HVAC

Whether it is a packaged unit that needs setting by crane, a rooftop unit that has stopped, or a maintenance agreement across several sites, tell us what the building needs and we will quote it properly.