Replacing like for like assumes the original sizing was right. Often it was not, and the building has changed since.
Rooftop and package changeouts · Expansion and renovation additions · Multi-zone design · Permitting coordinated
The short answer
At some point, every commercial HVAC system reaches a stage where continued repair is no longer cost effective. It might be an aging rooftop unit that has already needed multiple repairs this year, or a building expansion or renovation that has outgrown what the existing system can support. In any case, a replacement or addition that performs properly starts with an accurate load calculation, not simply matching the tonnage of the previous equipment.
Based in Sarasota and serving businesses throughout Collier County, Hillsborough County, Lee County, Manatee County, Pinellas County, Sarasota County and surrounding areas, Putnam Mechanical provides complete commercial HVAC system replacements and additions across Florida’s Gulf Coast. From straightforward rooftop unit changeouts to new systems required by building expansions or changes in occupancy, our experts size new equipment based on your building’s actual cooling load, current insulation and window performance, and occupancy patterns. We do not rely only on the nameplate rating of the old unit, which may have been oversized, undersized, or no longer appropriate for current building codes and modern energy efficiency standards.
Putnam Mechanical LLC · 7228 21st St E, Sarasota, FL 34243 · 941-280-4440
Scope of work
In detail
For many commercial properties in Sarasota and throughout Collier, Hillsborough, Lee, Manatee, Pinellas, and Sarasota Counties, a system that has needed more than two or three significant repairs in the past year, is approaching or past 12 to 15 years of Florida runtime, or is using a refrigerant type being phased out of production, is usually a better candidate for replacement than repair. Putnam Mechanical, headquartered in Sarasota, will review the equipment's repair history, condition, and remaining expected life before recommending either option. Our goal is to identify the most practical long-term solution for your building rather than defaulting to replacement.
Simply replacing an old rooftop unit with a new one of the same tonnage is a common mistake. Buildings change over time with added equipment, renovated spaces, updated insulation, and different occupancy levels, so the original system's sizing may no longer match current conditions. An undersized replacement runs constantly and never fully conditions the space. An oversized one short-cycles, wastes energy, and struggles with humidity control because it cools the air faster than it can dehumidify it. Putnam Mechanical performs current load calculations for your facility before recommending equipment size, rather than assuming the old capacity was ever correct.
Replacement is planned work. If the existing equipment has failed and the building is warming up now, call the emergency line.
Related Commercial Services
The other side of the decision, with the same 12-to-15-year runtime threshold applied.
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Replacement is the moment efficiency standards actually change what you pay monthly.
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New equipment on leaking ducts still will not condition the space properly.
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Multi-zone comfort problems are often balance rather than capacity.
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What keeps the new system from repeating the old one's repair history.
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Rooftop, split, multi-zone, VRF and mini-split repair while a replacement is being planned.
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Tell us what the building does now rather than what it did when the current unit went in. We will calculate the actual load and size against that.
Putnam Mechanical LLC · License # CAC1819526 · 7228 21st St E, Sarasota, FL 34243 · Serving Collier, Hillsborough, Lee, Manatee, Pinellas and Sarasota counties
We look at your equipment's age, repair history, and remaining expected life. Frequent repairs, equipment nearing 15 years old, or systems using a phased-out refrigerant are usually better replacement candidates than repair candidates.
Not necessarily, and it shouldn't be assumed. We calculate your building's current cooling load before recommending equipment size, since the old unit's tonnage may not reflect your building's actual current needs.
Timelines vary by project scope, equipment availability, and any permitting requirements, but we'll give you a specific timeline as part of your project quote.
Yes. We coordinate the permitting process as part of the replacement project so you're not managing that separately.
Cost depends on the system type, the specific failure, and parts required. We diagnose first and give you a clear cost estimate before any repair work begins, so there's no guessing on the invoice.
From emergency walk-in cooler repair and refrigerant leak detection to rooftop unit service, compressor replacement, ductwork correction, ventilation support, preventative maintenance, and full system upgrades, our licensed Florida technicians are ready to respond.
Putnam Mechanical has proudly served commercial clients with dependable refrigeration and HVAC solutions. Headquartered in Sarasota, Florida, our experienced technicians specialize in commercial HVAC repair, refrigeration system installation and design, ice machine maintenance, compressor repair and replacement, controls and monitoring systems, energy efficiency upgrades, food safety and temperature compliance services, and 24/7 emergency service throughout Collier, Hillsborough, Lee, Manatee, Pinellas, Sarasota counties, and surrounding areas.
License # CAC1819526
