AC Freezing Up? Ice on Coils in Tampa

An AC freeze happens when your evaporator coil drops below 32 degrees Fahrenheit and the moisture pulled out of your indoor air turns to ice instead of draining away. In Tampa, this is one of the most common service calls we run because our systems run hard year round, even in February. The longer the system runs frozen, the more ice stacks up on the copper line set, the indoor coil, and sometimes the entire blower housing. By the time most homeowners notice, the air coming out of the vents is barely moving and the unit is dripping water onto the floor or ceiling.

Here is the ranked list of causes we see week after week in Tampa Bay homes. Number one is low refrigerant. Even a small leak, around 5 percent of the charge, can starve the coil enough to freeze it inside 24 hours of Florida runtime. Number two is a dirty air filter restricting airflow over the coil so the cold has nowhere to go. Number three is closed or blocked supply vents, often furniture pushed against a register or a guest room shut off. Number four is a failing blower motor pushing low CFM, which mimics a dirty filter but the filter looks clean. Number five is a dirty evaporator coil with biofilm, dust, and pet dander insulating the fins so heat transfer drops and the coil overcools. Number six is a thermostat set too low, like 60 degrees, when the system simply cannot pull the room down that far without freezing. Number seven is warm humid attic air leaking around the air handler cabinet so condensation forms on cold metal and freezes solid.

A frozen coil is not just a cooling problem. When that ice melts, the drain pan can overflow and flood drywall, ceilings, and insulation. We see ceiling repair bills run into the thousands when a homeowner keeps running a frozen system overnight.

What it costs to get a frozen AC running again in Tampa Bay depends entirely on what caused the freeze. Here is the honest range we quote off our service truck.

Filter replacement runs $0 to $50 depending on size and MERV rating. If a clogged filter was your only problem, you are walking out of this with a small bill and a lesson about 60-day filter changes in Florida. Coil cleaning with a foaming biocide is $295 to $495 and includes pulling the blower assembly to access the coil face and flushing the drain line at the same time. Refrigerant leak repair plus full recharge ranges $495 to $1,495 and the spread is real. A leaking schrader valve is a 20-minute fix. A pinhole in the evaporator coil is a coil replacement. Refrigerant recharge only, when we find a small annual loss with no active leak, is $245 to $495 depending on system size and refrigerant type. Blower motor replacement is $475 to $725 for a standard PSC motor and more for an ECM variable speed.

Compressor replacement after a freeze is rare but possible if the homeowner kept running it for days. That runs $1,995 to $3,995 and at that price point we will walk through repair versus replace honestly. Full system replacement on an aging condenser, especially anything 12 years or older, runs $7,500 to $13,500 installed depending on tonnage, SEER2 rating, and whether ductwork needs attention.

One real factor for 2026: the R-454B refrigerant transition. R-410A is being phased out, and the cost to recharge older R-410A systems is climbing every quarter as supply tightens. If your unit is on R-410A and needs more than $1,500 in repair, replacement math gets close. We give you both numbers on every quote so you decide. FREE estimates, FREE diagnosis, and we never pressure you into a replacement.