Twelve Duval County summers later, your air conditioner has reached the fork

The twelve-year mark, as seen from Sandalwood

The Arlington subdivisions that began around 1960 have been through four or five air conditioners apiece. The newest wave of replacements went in around 2012 and 2013, and those units are now at the age where a Jacksonville summer stops being gentle with them.

A system here starts its real work in late May, when highs cross 85 and stay there, and does not get a rest until late September. Multiply that by twelve years and a condenser has logged the equivalent of eighteen or twenty summers somewhere with a normal climate. Compressors get tired. Coils thin. Capacitors drift out of tolerance.

So when the twelve-year-old air conditioner in Sandalwood or Mandarin needs a second major repair in a season, the homeowner stands at a fork: fix it again, or buy a new one before the next heat wave makes the decision for them.

What cooling-only equipment has to do in this climate

A straight-cool air conditioner is a condenser outside, an evaporator coil at the air handler, and a backup heat source that is not a heat pump: gas furnace, electric strips, or nothing much at all. It only has one job, but in Duval County that job is harder than the thermostat suggests.

From June through August the dew point averages 71 to 73 degrees. By early August the air is muggy on roughly 95 to 98 percent of days. An air conditioner here is a dehumidifier first and a cooler second, and it dehumidifies only while running. A unit that is oversized for the house cools the air quickly, shuts off, and leaves the moisture behind.

Straight-cool strengths and weaknesses

Where it wins. Simpler than a heat pump, with no reversing valve or defrost cycle to fail. Slightly less expensive to buy at the same efficiency. The obvious choice if the house already has a gas furnace on the TECO Peoples Gas system and the owner likes it.

Where it loses. It cannot heat. Jacksonville averages about 14 freeze nights a winter and a handful of hard freezes at or below 26 degrees, so a house without a furnace falls back on electric resistance strips, which are the most expensive heat JEA sells. For a house without gas, a straight-cool unit paired with strips is almost always the wrong buy.

Ask which side of the fork you're on

Air conditioner plus furnace, or heat pump?

That table is the whole comparison. If there is no gas line, we will steer you to the heat pump page rather than sell you an air conditioner.

What moves the number on a quote

Cost drivers, in rough order of weight:

1. Efficiency tier. Single-stage, staged or variable-capacity, and whether the unit clears JEA’s rebate threshold.
2. Tonnage. Set by a load calculation of the house itself, never by matching the old nameplate.
3. The coil. A new condenser nearly always needs a new matching evaporator coil; mismatches void warranties and waste the efficiency you paid for.
4. Ductwork. On 1960s block ranches and 1920s urban-core houses, duct repair can rival the equipment.
5. Site conditions. Raised pads in flood-prone San Marco lots, crane lifts for rooftop condensers on Southbank condos, coastal coatings at the Beaches.
6. Electrical. Surge protection, disconnect replacement, and the occasional panel that will not support a modern unit.

A new condenser can be spread across monthly payments, and a replacement estimate costs nothing. We quote the installed number before the work starts, and a Saturday failure of the old unit adds nothing to the bill.