Free tool, Dallas-Fort Worth
How much life is left in your rooftop unit?
Enter your unit age and square footage. Get a lifespan estimate based on the ASHRAE 15-year median and a rough tonnage guideline in under 30 seconds.
Commercial rooftop units have a median service life of about 15 years, according to ASHRAE guidelines. This free tool estimates how many years remain on your unit and gives a rough tonnage range for your space so you can plan maintenance, budgets, and replacement decisions before an emergency forces your hand.
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What affects rooftop unit lifespan
The 15-year figure is a median. Several factors can push a unit well past that or cut it short by years.
- Maintenance history: units on a preventive maintenance plan routinely outlast neglected units by 3 to 5 years
- DFW heat and sun exposure: Dallas summers with sustained 100+ degree days and direct rooftop sun accelerate wear on capacitors, contactors, and compressors
- Run hours: a 24/7 data center load ages a unit far faster than a 9-to-5 office load
- Refrigerant type: units running R-22 (phased out under EPA regulations) face rising refrigerant costs and shrinking supply, which changes the repair vs. replace math
- Install quality and sizing: an undersized or oversized unit runs harder and fails sooner regardless of how well it is maintained
Rooftop unit lifespan: common questions
How long does a commercial rooftop unit last?
The ASHRAE median commercial RTU service life is about 15 years. That is a planning guideline, not a guarantee. Units with consistent preventive maintenance and lower run hours often reach 18 to 20 years. Units that ran hard, missed service, or operated on phased-out R-22 refrigerant frequently fail before year 12. Age is one factor; condition and maintenance history matter just as much.
How many tons of cooling do I need per square foot?
A rough planning rule of thumb for commercial spaces is 1 ton of cooling per 350 to 450 square feet. A 5,000 sq ft office might need roughly 11 to 14 tons. This range is a guideline only. Actual sizing depends on ceiling height, occupancy, glass exposure, internal heat loads, and local climate. Proper sizing requires a Manual N or block load calculation by a qualified engineer or contractor.
When should I replace instead of repair a rooftop unit?
A common industry rule of thumb is the $5,000 rule: if the unit is past 50 percent of its expected service life and the repair costs $5,000 or more, replacement usually makes more financial sense than repair. Other signals include repeated compressor failures, R-22 refrigerant (being phased out, costly to source), declining efficiency that raises utility costs, or a unit past 15 years with a major failure pending. The free Rooftop Risk Report gives you a unit-by-unit breakdown to help make that call.
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