Cooling-Only Electric Cost Tool
Monthly AC Operating Cost Calculator
Use this tool to explore a cooling-load scenario. The starting hours and capacity are editable examples, not measurements of your home. Leave the optional rate blank for kWh only; enter usage charges from your rate plan to estimate cost.
Last updated September 6, 2026Methodology sources and assumptions below
Quick answer
How much does it cost to run AC per month in Florida?
Monthly cooling cost depends on modeled cooling energy and the electricity usage rate you enter. Estimate kWh from capacity, a matched-system SEER2 rating and equivalent full-load hours; add a rate only when you want a dollar estimate. This is not a whole-bill forecast.
How This Calculator Works
Monthly cooling kWh = tons x 12,000 Btu/h per ton x equivalent full-load cooling hours per day x days per month / SEER2 (Btu/Wh) / 1,000. Monthly cooling energy cost = monthly kWh x the entered usage rate. Using one seasonal efficiency rating for a month is an approximate average, not measured instantaneous power.
Florida Factors to Review
Equivalent full-load hours express the load as time at stated capacity, not simply thermostat or fan runtime. Variable-capacity equipment may run longer at lower output. Weather, humidity, ducts, settings and equipment condition affect actual South Florida cooling use; the model holds seasonal efficiency constant.
Choosing Your Electricity Usage Rate
The rate starts blank. Enter the per-kWh energy, fuel and other usage charges from your rate plan, excluding fixed monthly fees and taxes. A fixed fee does not disappear when HVAC use falls, so whole-bill cost divided by kWh is not necessarily the cost avoided by saving electricity. No utility tariff or current price is assumed here.
Your entered rate applies to the full modeled period. Tiered, time-of-use, minimum-bill and changing prices require more detail than one rate can provide. Dollar results estimate HVAC energy cost, not your total bill or guaranteed savings.
Methodology Sources
These sources explain rating definitions, usage charges and equivalent full-load-hour methods. They do not validate the starting scenarios for a Palm Beach County home. The cooling evaluation protocol is a historical methodology reference, not a current local calibration.
Calculator FAQs
Does this show my whole electric bill?
No. The estimate covers cooling electricity at your entered usage rate. Fixed fees, taxes and other equipment are excluded. Include per-kWh usage adjustments in your rate; a single price only approximates tiered, time-of-use, minimum-bill or changing tariffs.
What if my AC runs almost all day?
Do not enter thermostat runtime as full-load-equivalent hours without checking the load assumption. A variable-capacity system can run for long periods at reduced output. If comfort has changed or the bill has risen, CCS can review airflow, equipment condition and usage context.
Can maintenance lower monthly AC cost?
Maintenance can help when filters, coils, drains, airflow, thermostat setup, or outdoor-unit clearance are increasing runtime or reducing efficiency.
Estimate Disclaimer
Calculator results are planning estimates for homeowner education. They are not a Manual J load calculation, diagnostic finding, utility bill audit, financing approval, rebate confirmation, or installed-price quote. Climate Control Services can inspect the home, review equipment, and explain written options before work begins.