Air conditioning replacement in Kendall, and what the climate here demands
Kendall runs about 2544 cooling degree days a year, which is a direct proxy for how many hours the compressor will actually turn - and compressors wear out by running hours, not by calendar years.
Replacement, 3-ton system: $5,500-11,000 (national)
Condenser only: $2,800-5,200 (national)
Cooling degree days near Kendall: 2544
Permits pulled through: Miami-Dade County
Median home in Kendall built: 1978
Homes heated by electricity: 91% (gas 4%)
Water hardness: 216 mg/L (very hard)
Detached houses: only 40% - many units need HOA sign-off
Free written quotes, one local company
Kendall runs about 2544 cooling degree days a year, which is a direct proxy for how many hours the compressor will actually turn - and compressors wear out by running hours, not by calendar years.
Dry heat and runtime in Kendall
2544 cooling degree days at only 0% humidity with 24 days above 90F, so the load is running hours, sun and dust rather than dehumidification; the median home dates from 1978, and ductwork and insulation of that era rarely keep up with a modern system, so the ducts are worth looking at before you replace.
That is why the numbers on the label matter less here than how the unit is installed and kept clean. A condenser choked with dust in this climate loses efficiency long before it loses refrigerant.
What replacement costs
| Scope | Installed price | When it applies | Typical life |
|---|---|---|---|
| Condenser only | $2,800-5,200 | Coil and air handler are sound and matched | 10-15 years |
| Full split system | $5,500-11,000 | Coil is old or mismatched | 12-18 years |
| System plus ductwork | $8,000-17,000 | Ducts leak or were never sized right | Ducts last decades |
| Heat pump conversion | $7,000-15,000 | Where winters are mild enough | 12-18 years |
Kendall gets roughly 24 days a year above 32 Celsius, and those are the days a system that is even slightly undersized will never catch up.
The median home in Kendall dates from 1978, which is a good guide to what the ductwork looks like behind the walls.
National ranges, 2026
| Work | Typical installed cost | What decides it |
|---|---|---|
| Condenser replacement | $2,800-5,200 | Tonnage and efficiency tier |
| Full system, 3 ton | $5,500-11,000 | SEER tier and line-set condition |
| Duct sealing | $800-2,500 | Accessibility |
| Manual J load calculation | $250-600 | The one thing worth paying for up front |
These are national ranges. We have not collected enough quotes in Kendall to publish a defensible local range, and we would rather say so than invent one.
Questions homeowners in Kendall ask
Permits pulled through: Miami-Dade County
Median home in Kendall built: 1978
Detached single-family houses: 40%
Water hardness: 216 mg/L (very hard)
Dominant soil series: Dade
Clay content: 0%
Shrink-swell (LEP): 0.0 - low
Annual rainfall: 69 inches
The ductwork behind the walls is older than the equipment
The median Kendall home dates to about 1978. Ductwork from that period was commonly sized for higher supply temperatures and lower airflow than modern equipment wants, and it is often unsealed at the joints. **A new high-efficiency unit connected to undersized ducts will not deliver its rated performance** - it will be loud, it will short-cycle, and the far bedroom will still be warm. Ask whether the quote includes a static pressure reading on the existing system. If nobody measured it, nobody knows.
Only 40% of housing here is detached - that changes the job
Just 40% of homes in Kendall are detached houses. In attached and stacked housing the equipment is often on a roof or in a shared chase, the condenser location may be fixed by the association, and the work needs written approval before it starts. **Ask whether the contractor has done work in your building or association before, and who files the approval.** A quote that ignores this is a quote that is about to be stopped on the day of installation.
Nearly everything here is electric
About 91% of homes in Kendall heat with electricity. That makes the replacement decision different from a gas market: **you are not choosing between a furnace and a heat pump, you are choosing between resistance strip heat and a heat pump**, and the running-cost gap between those two is large. Ask the bidder to show the heating output at your design temperature and what the backup is. Resistance backup that engages too eagerly will erase the savings the heat pump was bought for.
Water at 216 mg/L shortens the life of anything it touches
Municipal water here runs about 216 mg/L of hardness. That matters for HVAC in two specific places: **any humidifier plumbed into the system, and the condensate line.** Scale builds in the humidifier pad and in the trap, and a blocked condensate trap is one of the most common summer no-cool calls in this city - it trips the float switch and shuts the system down. Ask whether the quote includes a serviceable trap you can clear yourself, and what the annual service actually touches.
Who pulls the permit - and whose name is on it
Work in Kendall is permitted through Miami-Dade County. Two questions decide whether a quote is honest: **does the price include pulling the permit, and will the company pull it in its own name?** A contractor who asks you to pull it as the homeowner is moving liability onto you - if the inspection fails, it is your permit that failed. Ask for the licence number the permit will be filed under, then check it against the state licence board before you sign anything.
Common questions
Should I just get a bigger unit so it cools faster?
No. Oversizing shortens compressor life through short-cycling and costs more up front for no comfort gain. What actually helps in a dry climate is a correctly sized system with a clean condenser and shading on the outdoor unit. Ask for a Manual J load calculation rather than a square-footage rule of thumb.
My system is 12 years old. Repair or replace?
The usual test is whether the repair costs more than about a third of a replacement, and whether the system uses R-22 refrigerant, which is no longer produced and has become very expensive. A 12-year-old R-410A system with a single failed part is usually worth repairing. The same age with a failing compressor is not.
Do the efficiency ratings pay for themselves?
It depends entirely on how many hours the system runs, which is exactly what the cooling degree day figure above measures. In a high-runtime climate a jump in efficiency tier can pay back in a handful of years; in a mild one the same upgrade may never pay back. Ask the contractor to show the arithmetic for your actual usage rather than a national average.
Why do quotes differ so much for the same house?
Usually because they are quoting different tonnages, different efficiency tiers, or including different amounts of duct and line-set work. Ask each company to state the tonnage, the efficiency rating, and what happens to the existing ducts. Once all three are stated the same way, most of the spread becomes explainable.
- Kendall
Get written quotes in Kendall
Tell us the age of the system, what it is doing wrong, and whether some rooms are worse than others. That last detail often points at ducts rather than the machine. We pass it to one independent local company. No cost, and we do not sell your details on.
Or call (877) 701-2518
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