Most commercial HVAC systems in Metro Detroit should be serviced at least twice a year, with one visit before the heating season and one before cooling season. Facilities with high occupancy, heavy kitchen exhaust, or continuous operation, such as restaurants, hospitals, and manufacturing plants, should schedule quarterly preventive maintenance to avoid mid-season failures and keep equipment running at rated efficiency.
Why Michigan’s Climate Demands a Consistent PM Schedule
Southeast Michigan puts commercial HVAC equipment through a full range of stress. Winters regularly drop into the single digits, and rooftop units running in those conditions are working hard. Summers in the Detroit area bring high humidity and heat that push cooling systems to capacity. A unit that missed its spring tune-up may run fine in May, but by July, that fouled condenser coil or worn belt becomes a breakdown waiting to happen during a 90-degree week.
Michigan’s shoulder seasons, March to April and October to November, are your window to service equipment before it’s needed most. A Carrier, Lennox, or Trane rooftop unit that gets serviced in March is ready to handle summer load. One that doesn’t often fails in August when parts lead times and technician availability are at their worst.
Minimum Service Frequency by Facility Type
Here’s a practical guide based on what SAMCO FM sees across Metro Detroit commercial accounts:
- Standard office buildings: 2 visits per year, spring and fall. Low duty cycle, manageable air quality demands.
- Restaurants and commercial kitchens: Quarterly at minimum. Kitchen grease migrates into return air systems, condenser coils, and filters faster than in any other environment. Missing a single service interval in a restaurant often means a cleaning job that takes twice as long and costs significantly more.
- Retail spaces: 2 to 3 visits per year depending on hours, square footage, and occupancy. High-traffic stores with frequent door openings put added strain on systems.
- Healthcare and food processing: Monthly filter checks at minimum, with quarterly full PM visits. Air quality and temperature control are not optional in these environments.
- Warehouses and manufacturing: 2 visits per year for basic systems, more for facilities with process cooling or dust-generating operations.
What SAMCO FM Includes in a Commercial HVAC PM Visit
A preventive maintenance visit from SAMCO FM is not a filter swap and a signature on a form. Our technicians check and document the following on every PM visit:
- Filter inspection and replacement
- Condenser and evaporator coil cleaning
- Belt and bearing inspection on belt-drive units
- Electrical connection tightening and amp draw measurements on contactors, capacitors, and motors
- Refrigerant pressure checks and leak inspection
- Economizer operation and damper calibration
- Drain pan and condensate line cleaning
- Thermostat and control sequence verification
- Gas heat operation check, including heat exchanger inspection for cracks on applicable units
- Documentation of unit condition, including any deferred repairs
We service Carrier, Lennox, and Trane rooftop units across the area, along with split systems, air handlers, and packaged units from most major manufacturers.
What Skipping Maintenance Actually Costs
Business owners sometimes delay PM to save money. The math usually doesn’t work out. A typical commercial HVAC PM visit runs a few hundred dollars per unit. A compressor replacement on a Carrier or Trane RTU runs several thousand. A full unit replacement, which is what happens when deferred maintenance accelerates equipment degradation, can run $10,000 to $30,000 or more depending on tonnage and configuration.
Beyond repair costs, there’s energy waste. A dirty condenser coil can reduce efficiency by 20 to 30 percent, which means you’re paying more in electricity every month just to get the same cooling output. Over a Michigan summer, that adds up quickly across a multi-unit facility.
SAMCO FM offers PM contracts that lock in service intervals, pricing, and priority scheduling. Facilities on a PM contract also receive priority dispatch during peak seasons, when service demand is highest and emergency response times are longest.
When to Call a Professional
If your last HVAC PM visit was more than 6 months ago, or if you don’t have documentation of when the last service was performed, it’s time to get a technician on site. SAMCO FM has been serving commercial facilities in Metro Detroit and Southeast Michigan since 1997. Our team brings 90+ years of combined experience across HVAC, refrigeration, and food equipment systems.
We can perform a single PM visit or set up an ongoing service agreement for your facility. Call (734) 838-6300, email service@samcofm.com, or request a PM assessment online. We serve commercial accounts in Wayne, Oakland, Macomb, Washtenaw, and surrounding counties.
Frequently Asked Questions
Do I need to service my HVAC if it seems to be working fine?
Yes. Most commercial HVAC failures don’t happen without warning, but the warning signs are things a technician catches, not a building manager. Low refrigerant charge, a cracked heat exchanger, a capacitor that’s reading low, a contactor with pitting, these are not visible during normal operation. By the time a system running with these conditions fails, the damage is usually worse and more expensive than if it had been caught at a PM visit.
How do I know if my Carrier or Trane RTU needs service now?
Signs include uneven cooling or heating across zones, higher-than-normal utility bills, short cycling (the unit turning on and off in rapid succession), unusual noise from the rooftop unit, or a system that runs constantly but doesn’t reach setpoint. Any of these warrant a service call, not just a PM visit.
What’s the difference between a PM contract and a service contract?
A PM contract covers scheduled preventive maintenance visits at agreed intervals. A service contract, sometimes called a full-coverage or comprehensive service agreement, typically includes emergency service calls and may cover parts and labor for repairs. SAMCO FM offers both, and the right option depends on equipment age, budget, and how much downtime risk your facility can tolerate.
How do I get a PM schedule set up for a facility with multiple units?
Contact SAMCO FM to schedule a site assessment. We’ll document your equipment inventory, review existing service records if available, and recommend a PM schedule that fits your operations and budget. Multi-unit facilities often benefit most from PM contracts because staggered scheduling keeps all units current without large up-front costs.
