Installing a central heating and cooling system in Central Florida is less about the afternoon the new condenser lands on its pad and more about the decisions made before it arrives. A house in Oviedo runs its air conditioning for most of the year and fights indoor humidity all summer. Its ductwork usually runs through an attic that can pass 130 degrees, and the outdoor unit has to stay put through hurricane season. A professional installation follows a set sequence of measurement, design, permitting, installation, testing and inspection, and each stage protects the one after it.
A state certified air conditioning contractor (license CAC1815924) based in Oviedo, universalrepairservices.com handles every one of those stages in house. Its work runs from the initial HVAC system design through equipment sales and installation to routine maintenance and 24/7 emergency repair. Its crews regularly install Trane equipment and Honeywell thermostats in Oviedo, Winter Springs, Casselberry, Chuluota and East Orlando. Homeowners planning an Oviedo hvac installation can start with the Request an Estimate form on the site to book an in-home evaluation.
Measuring the House Before Choosing Anything
The workflow starts with a site survey, not a catalog. The technician gathers what is needed for an ACCA Manual J load calculation, the industry method for estimating how much heat and moisture a house gains on a design day. Around Oviedo that design day sits in the low 90s with a very high dew point, so the moisture side of the load carries real weight.
- Measure every room, ceiling height and window, noting which glass faces west.
- Record attic insulation depth and roof color, and check whether the attic is vented or sealed with spray foam.
- Note where the air handler sits, how large the returns are and what thermostat controls the system.
- Ask how the household actually lives, including occupants, home office equipment and the rooms that always run warm.
The size of the old unit is not part of this list on purpose. The Air Conditioning Contractors of America makes the point in its guidance on load calculations in existing homes: the load still has to be known even when the structure has not changed.
Turning the Load Into a System Design
With the load in hand, the designer moves to equipment selection under ACCA Manual S. This matches a real model’s cooling and moisture removal capacity to the load instead of rounding to the nearest ton. In a humid climate the analysis often favors two stage or variable speed equipment, which runs long, low cycles that keep the indoor coil cold enough to pull water out of the air.
Federal minimums frame the choices. Split air conditioners sold in the Southeast must reach at least 14.3 SEER2 below 45,000 Btu per hour, and heat pumps must meet 14.3 SEER2 and 7.5 HSPF2. New residential systems now ship with A2L refrigerants such as R-454B or R-32, because manufacturers stopped building R-410A split systems for this market in 2025. The outdoor unit, indoor coil and air handler are therefore chosen as one matched set with an AHRI certificate number. Electric heat strips are sized for a January cold snap, which in most Oviedo homes means 5 to 10 kilowatts rather than the largest kit on the shelf.
Evaluating the Ducts in the Attic
Ductwork can undo a well chosen system without anyone noticing. Research from the Florida Solar Energy Center on duct leakage in central Florida homes found leaks to be large and widespread. Air conditioner energy use fell by about 18 percent in monitored homes after the ducts were repaired.
- Walk the attic and inspect flex duct for sags, kinks, crushed runs and torn outer jackets.
- Measure total external static pressure with the old system running.
- Check the air handler platform and return plenum, the usual spots where hot attic air gets pulled straight into the system.
- Decide whether to seal joints with mastic, enlarge undersized returns using ACCA Manual D, or replace damaged runs outright.
Permits and Paperwork
No equipment is set until the permit is in place. Homes inside Oviedo city limits are permitted through the city’s building division. Properties in unincorporated Seminole County go through the county, which offers an expedited EZ permit path for like for like air conditioning replacements. The application identifies the equipment and its AHRI matched rating. Florida law also calls for a recorded Notice of Commencement when a heating or air conditioning replacement contract reaches $15,000 or more.
Installation Day
- Recover the old refrigerant into approved cylinders before any line is cut, as federal rules require.
- Set the new condenser on a level, raised pad and anchor it with hurricane tie downs, since the Florida Building Code requires exterior equipment to resist local design wind loads.
- Install the air handler with a secondary drain pan and float switch wherever it sits in an attic or above a finished ceiling, then trap the condensate line and add a cleanout.
- Braze refrigerant joints while nitrogen flows through the lines to prevent internal scale.
- Pressure test the system, then pull a deep vacuum below 500 microns and confirm it holds before releasing refrigerant.
- Wire the disconnect and breaker, plus the refrigerant leak sensor that many A2L air handlers now include.
Startup and Commissioning
Commissioning is the step that shows whether the design worked. The technician sets blower airflow, usually near 350 to 400 cubic feet per minute per ton. The lower end of that range is often used in humid homes because slower air over the coil removes more moisture. Refrigerant charge is then fine tuned by subcooling to the manufacturer’s target. Static pressure, temperature split and amperage are recorded as a service baseline. The thermostat is configured last: the fan is left on auto so water on the coil drains instead of blowing back into the house, dehumidification settings are enabled where the equipment supports them, and an auxiliary heat lockout keeps the strips from running on mild winter mornings.
Final Inspection
The job is not finished until the inspector signs off. The inspection confirms that the installed equipment matches the permit and that the tie downs, electrical disconnect and condensate disposal meet code. Once it passes, the permit is closed. Open permits can complicate a home sale or insurance claim later. In a region where hurricane season runs from June through November, the inspection is also the last independent check that the outdoor unit is fastened well enough to stay in place through a storm.
