Building Maintenance

Commercial HVAC in Metro Detroit

Rooftop units, ductwork, controls and preventive maintenance across Metro Detroit. We're also the roofer, so when a unit gets swapped, the curb and the flashing around it are the same company's problem.

Request a Bid (248) 817-6913

What We Do

The unit is on the roof, and so are we

Almost every commercial building in this market heats and cools from the roof. That's where the packaged rooftop units sit, and it's where the two most expensive conversations a property manager has both start: the unit that finally quit, and the leak that showed up around the curb after somebody replaced one.

Here's the part most HVAC companies can't offer: AGP self-performs commercial roofing too. When we set a new rooftop unit, the curb, the flashing and the membrane around it are done by our own roofing crew under the same contract. Nobody gets to say the leak was the other trade's fault, because there is no other trade.

We work direct for building owners and property managers across Metro Detroit: offices, retail centers, professional and medical suites, and multi-family buildings. Repairs, replacements, preventive maintenance programs, and full mechanical scope on build-outs.

Scope

HVAC work we take on

Replace

Rooftop unit replacement

Packaged RTU changeouts sized to how the space is actually used now, not how it was used in 1994. Crane day, curb adaptation, roofing detail and startup handled by one company on one date.

Repair

Diagnostics & repair

Compressors, motors, boards, belts, contactors and the intermittent fault that only happens when nobody's watching. We tell you what failed, why, and whether the next thing on the unit is close behind it.

Prevent

Maintenance programs

Scheduled spring and fall visits: filters, belts, coils, drains, electrical connections and refrigerant checks, closed out with a photo report and a short priority list per unit. The cheapest HVAC money you'll spend.

Move

Ductwork & air distribution

New duct runs, diffusers and returns when a floor plan changes, plus balancing so the new conference room isn't the one office nobody can sit in.

Control

Thermostats & controls

Programmable and networked thermostats, zone controls, and lockouts that stop a tenant from running heat and cooling against each other all winter.

Build

Build-out mechanical

Full mechanical scope on office and retail build-outs: unit sizing, duct layout from the prints, controls, permits and inspection, sequenced with the framing and drywall instead of behind them.

The Real Questions

Repair or replace: we show our math

The HVAC industry has the same incentive problem roofing does. The company diagnosing your unit is usually the one that profits most if the diagnosis is "replace it." Our rule is the same on both roofs and rooftop units: show the evidence and price the honest options side by side. A twelve-year-old unit with a bad contactor needs a contactor.

The flip side gets said just as plainly. When a unit is past its service life, when the compressor is the third major failure in two seasons, when it runs on a refrigerant that now costs more than the part it's going into, repairs have quietly become the expensive option. We'll show you the service history that proves it and price the replacement against another year of patching.

Tenants, complaints and the paper trail

A property manager's real HVAC problem usually isn't mechanical, it's the complaint log. Every visit we make closes out with a dated photo report per unit, so when a tenant says the suite has been too warm since spring, you have something to answer with besides memory. That record is also what turns a replacement conversation with ownership from an argument into a decision.

Sizing, and why the old number is the wrong number

Replacing a unit with the same tonnage that was there before is the fast answer and often the wrong one. Buildings change: a floor gets split into suites, an open office fills with people and equipment, someone adds windows or takes out a wall, a warehouse bay becomes a showroom. Oversized units short cycle, wear out early and never dehumidify properly, which is why a brand new unit can somehow feel worse than the one it replaced. We size to the building as it's used today.

The curb, the flashing and where leaks actually start

A rooftop unit changeout is a roofing job wearing a mechanical hat. The old unit comes off, the curb is exposed, and the new unit either fits it or needs an adapter. That detail is where a large share of "new leak, no idea why" calls come from the following spring. Because our roofers and our mechanical crew work for the same company, that detail gets flashed properly and photographed, and there's nobody to point at if it doesn't.

Why It's In House

One company on the roof, not three

The normal version of a rooftop unit replacement involves a mechanical contractor, a roofer, a crane company and an electrician, coordinated by whoever answers the phone. Four vendors, four schedules, four insurance certificates, and four opinions about who caused the leak. We self-perform the mechanical, the roofing and the electrical, so that job is one contract and one date.

Fully licensed and insured. License and insurance documentation comes with the bid, so you're holding it while you're deciding, not chasing it afterward. And every job gets permitted and inspected: a closed permit means the city looked at the work and signed off on it, which is a harder check than anything a contractor can say about itself.

2×yearly visits in a standard maintenance program

7trades self-performed under one contract

100%of service visits closed out with a photo report

Adjacent Work

Related services

Commercial RoofingCurbs, flashing and the membrane around the unit→ Commercial ElectricalUnit power, disconnects and controls wiring→ Commercial DrywallCeilings opened for duct, then put back→

FAQ

Commercial HVAC questions, answered straight

Should I repair this rooftop unit or replace it?

It depends on age, what failed, and what the service history looks like. A single component failure on a unit with years left in it is a repair. A third major failure in two seasons on an aging unit is a replacement wearing a repair costume. We show the evidence and price both side by side rather than telling you the answer we'd prefer.

Do you fix the roof around the unit when you replace it?

Yes, and that's the reason to call us instead of a mechanical-only contractor. The curb, the adapter, the flashing and the membrane are done by our own roofing crew under the same contract and photographed. When one company owns both, there's no argument next spring about where the leak started.

What does a maintenance program include?

Two scheduled visits a year, typically spring and fall, covering filters, belts, coils, condensate drains, electrical connections and refrigerant checks, plus a photo report per unit with a prioritized list: fix now, watch, budget for next year. It's the cheapest way to stop being surprised in July.

Can you replace a unit without shutting the whole building down?

Usually yes. Most packaged units serve a zone rather than the whole building, so a changeout affects one area for one day. We schedule the crane and the outage window around your tenants and give you notice you can forward to them.

One suite is always too hot and the one next to it is freezing. Is that fixable?

Almost always, and it's usually not the unit. It's typically distribution or controls: a duct run that was never balanced, a diffuser closed years ago by somebody who's since moved out, a thermostat reading a wall that gets afternoon sun. We diagnose the airflow before recommending equipment, because replacing a unit doesn't fix a balancing problem.

Are you licensed for mechanical work, or is it subbed out?

Fully licensed and insured, and the techs are ours. You get the license and insurance documentation with the bid, while you're still deciding. We don't publish license numbers on the site for the simple reason that we have several licensed people and that roster changes; the paperwork you get with a bid is always current, and a page is not.

Do you work as a subcontractor for other general contractors?

No. We work direct for building owners and property managers. That's a deliberate choice: it's what lets us answer for the whole result instead of one scope inside somebody else's schedule.

Find out what your units are doing before July does.

Get an assessment with photos and a straight answer per unit: repair, maintain or replace, with the math shown.

Request a Bid