Free tool, Dallas-Fort Worth
Should you repair or replace that rooftop unit?
Enter the unit age and your repair quote. The calculator applies the $5,000 rule guideline and tells you which path usually makes more financial sense.
The $5,000 rule is a commercial HVAC planning guideline: multiply the unit age in years by the estimated repair cost. If that number exceeds $5,000, replacement is usually the better financial move. Below $3,500 and repair typically wins. The calculator below runs that math instantly and flags when age alone is a reason to plan for replacement.
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How the $5,000 rule works
The rule is straightforward: take the unit's age in years and multiply it by the estimated repair cost in dollars. A 10-year-old unit facing an $800 repair scores 8,000, which suggests replacement is worth pricing out. That same $800 repair on a 4-year-old unit scores 3,200, which is comfortably in the repair range. The $5,000 figure is a guideline built from decades of commercial HVAC field data, not a precise formula. Several factors can shift the answer in either direction.
- Unit age is past the roughly 15-year ASHRAE median service life
- System still uses R-22 refrigerant (discontinued; recharging costs have risen sharply)
- Two or more significant repairs in the past 24 months
- Rising energy bills even after recent repairs (a sign of declining efficiency)
- Manufacturer has discontinued parts for the model
Repair or replace: common questions
What is the $5,000 rule for HVAC?
The $5,000 rule is a planning guideline: multiply the unit age in years by the estimated repair cost. If the result exceeds $5,000, replacement typically delivers better long-term value than repair. It is a starting point, not a hard cutoff. Refrigerant type, repair history, and energy costs also matter.
How long does a commercial rooftop unit last?
ASHRAE pegs the median service life of a commercial rooftop unit at roughly 15 years. Units in high-use or high-heat environments like Dallas can fall short of that; units on a regular maintenance plan often exceed it. Once a unit passes 15 years, budget for replacement even if it is still running.
Is it cheaper to repair or replace a commercial AC unit?
It depends on the math. A single repair on a young unit is almost always cheaper upfront. But an aging unit that needs repeat repairs can cost two to three times more per year than a replacement on a maintenance plan. The calculator above runs the $5,000 rule to help you decide. For a unit-by-unit breakdown, request the free Rooftop Risk Report.
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