Light commercial HVAC in Birmingham, AL
A small shop, an office suite or a church sanctuary that runs too hot or too cold costs you customers, focus and comfort. We repair and maintain the rooftop units and split systems those buildings depend on.
Light commercial work covers the packaged rooftop units and split systems found on small retail buildings, offices, restaurant dining rooms and churches. Zeltman Heating & Air handles repairs, preventive maintenance, belts, filters, economizers and replacements for units of that size. We stay within light commercial equipment and do not take on large chillers or central plants.
Signs a rooftop unit or commercial split system needs attention
One space runs hot all afternoon
A single tenant space or classroom falling behind usually means a failing compressor, a slipping belt or a dirty condenser coil on that unit.
Squealing from the roof
A worn or loose belt squeals at startup and eventually snaps, leaving the blower still and the space without air.
Humid, clammy air indoors
An economizer stuck open or a unit too big for the space can leave the building cool but sticky.
Water dripping through the ceiling
Clogged condensate drains and failed curb seals let water into ceiling tiles, often right over a supply register.
Unit short cycling or tripping
Frequent starts point to controls, refrigerant charge or electrical faults that wear out compressors early.
No heat on the first cold morning
Gas heat sections on rooftop units sit idle all summer, so ignition and flame sensor faults show up in the first cold snap.
What light commercial covers, and where we draw the line
Most small commercial buildings around Birmingham run on packaged rooftop units, often called RTUs, that sit on a curb above the space they serve. A strip center might have one unit per tenant, while a church might have several serving the sanctuary, classrooms and fellowship hall. Smaller offices sometimes use residential-style split systems instead.
We work on rooftop units and split systems in that light commercial size range, with gas heat or heat pumps. Large chillers, cooling towers and central plant equipment are outside what we do. We say so up front rather than learn on your building.
Commercial units run longer hours than home systems and often bring in outside air for ventilation. That puts extra wear on belts, bearings and filters. Economizers, the dampers that use cool outdoor air instead of the compressor, stick or fail open more often than owners realize. A stuck economizer can pull humid Birmingham air straight into the building all summer.
A preventive maintenance schedule matters even more here than at home. Filters may need changing every one to three months depending on use, and belts need regular tension checks. We build a schedule around how the building is actually used, whether that is a weekday office or a church that fills up on weekends.
How a light commercial service call works
Call at any hour
A person answers 24/7. Tell us the building, which unit or space is affected and how to get roof access.
Safe roof access
We confirm ladder or roof hatch access and work around your hours where we can, including before opening or after close.
Diagnose on the unit
Power, controls, belts and airflow come first, then refrigerant and heating. You get the cause in plain terms.
Price before work
We give you the price before any repair, and on multi-unit roofs we flag which other units are showing wear.
Set up the PM schedule
After the repair, we can put the units on a preventive maintenance schedule with filter and belt changes logged each visit.
What a light commercial service visit covers
- Belts, pulleys and blower bearings
- Filters changed and filter racks checked for bypass
- Economizer dampers, actuator and outdoor air sensor
- Condenser and evaporator coils cleaned as needed
- Refrigerant charge read through superheat and subcooling
- Gas heat ignition, flame sensor and heat exchanger
- Condensate drains, traps and curb seals
- Thermostat schedules and occupied and unoccupied settings
What light commercial HVAC repair costs in Birmingham
$218 to $1,465
Most rooftop and commercial split system repairs fall in this range. Belt and filter jobs cost least, while a fan motor, an igniter or an economizer actuator lands toward the middle. Compressor work and unit replacement are priced separately, since crane access and tonnage change the number a lot. We give you the number before any work begins.
Ask for a price (659) 777-4129What moves the number
- Tonnage and unit type
- A 3 ton split system and a 10 ton rooftop unit carry very different parts and labor.
- Roof access
- A hatch, a fixed ladder, or a portable ladder over a high parapet all change how long it takes to get tools up.
- Crane needs
- Replacing a rooftop unit or a compressor often needs a crane, which is scheduled and priced into the job.
- After-hours work
- Repairs done before opening, after close or on a weekend can cost more than weekday daytime visits.
- Number of units
- Servicing several units on one roof in a single visit spreads the trip cost across all of them.
Light commercial HVAC around Birmingham
Small commercial buildings along corridors like Crestwood Boulevard, the Hueytown Road business corridor and Center Point Parkway lean heavily on packaged rooftop units. Many of those units carry long open hours through hot, humid afternoons, which is exactly when belts slip and coils clog.
Churches across the metro often run several units that sit idle midweek and then carry a full building on Sunday. That pattern hides problems until the busiest hour. A Saturday test run of each unit, with the thermostats set to occupied, catches a dead compressor or a snapped belt before the pews fill. The Woodlawn business district and Irondale sit close to our base on 15th Avenue North, and we cover offices and shops across Jefferson, Shelby and St. Clair counties. For older buildings with tired ductwork, our duct repair work applies too.
Areas we cover most often
We repair and replace equipment from these manufacturers, plus most other makes.
Questions about light commercial HVAC in Birmingham
We work on packaged rooftop units and split systems in the light commercial range found on shops, offices, restaurants and churches. We do not service large chillers, cooling towers or central plants, and we tell you up front if a building falls outside that range.
At least twice a year, spring and fall, with filter changes more often depending on use. Busy buildings may need filters every one to three months. Each visit covers belts, coils, economizer, drains and the heating section.
It is a set of dampers that brings in cool outdoor air when conditions allow, so the compressor runs less. When it sticks open in summer, it pulls hot, humid air into the building. We check the dampers, actuator and sensor on every visit.
Yes, and midweek often works well, since the building is quiet. We can schedule preventive visits ahead of busy services and events so every unit is tested under load before the room fills up.
Yes. Many small offices and shops use split systems similar to home equipment, sometimes several of them. We repair and maintain those along with packaged rooftop units, whether they run gas heat or a heat pump.
Yes. A person answers our line 24/7, and we can schedule work before opening or after close to keep disruption low. After-hours visits can cost more, and we tell you that cost on the phone first.
Related services and reading
- Package Unit Repair and InstallationAll-in-one gas packs and heat pump packages beside the house or on a slab.
- HVAC Maintenance PlanSpring and fall visits on a schedule, so nothing gets skipped.
- Ductwork Repair and SealingDisconnected runs, crushed flex, sweating ducts and leaky joints in attics and crawlspaces.
- Indoor Air Quality TestingHumidity, particle and airflow readings that show what is actually in the air.
- Why your AC can't keep up on muggy Birmingham afternoonsCooling guide
Need light commercial HVAC in Birmingham?
We answer 24/7. Tell us what the system is doing and we will tell you what happens next.