From Sanford to Oviedo, Lake Mary to Casselberry — your Seminole County home deserves HVAC service that shows up fast and gets it right. Lake Monroe and Lake Jesup humidity is punishing your system. We'll be at your door in 90 minutes or you get $200 off. Nearly 500,000 residents trust this county — and we've served it for 30+ years.
From a sudden breakdown to a full system upgrade, we offer every HVAC service your Seminole County home needs — all backed by our 90-minute arrival guarantee.
When your system fails at 2 AM in Sanford, Lake Mary, Casselberry, or anywhere in Seminole County, we answer the phone and dispatch immediately. Available 24/7, 365 days for all Seminole County zip codes.
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We perform a Manual J load calculation on every Seminole County home — from 1,200 sq ft Fern Park ranch homes to 5,000+ sq ft Heathrow estates. Proper sizing across this diverse county is critical for efficiency.
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Lake Monroe, Lake Jesup, the St. Johns River, and the Wekiva River create massive humidity across Seminole County. Our tune-ups include mold checks, duct inspections, and dehumidification optimization for every home.
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When cold fronts sweep through Seminole County, older 1970s–1980s homes with minimal insulation get cold fast. We repair and install heat pumps, furnaces, and electric heaters county-wide.
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Seminole County's massive lake systems, rivers, and year-round warmth create persistent mold and IAQ concerns. We offer whole-home dehumidifiers, UV air purification, and professional duct sanitization.
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With AC running 8–10 months per year in Seminole County, a smart thermostat is one of the fastest ways to cut energy costs. We install every major brand and include a free WiFi thermostat with new system installs.
Learn about smart thermostats →Our headquarters is right here on Curry Ford Road in the 32825 zip code. When you call us, you're calling a family that lives, works, and raises their kids in Seminole County — not a call center in another state.
No other Seminole County HVAC company makes this promise. If our technician isn't at your door within 90 minutes, we take $200 off your service. We cover all 309 square miles — from Sanford to Oviedo, Lake Mary to Casselberry, and every unincorporated community in between.
Seminole County's 215,000+ homes span rural Chuluota homesteads to brand-new Heathrow estates. The suburban core — Altamonte Springs, Casselberry, Longwood — is dominated by 1970s–1980s construction with aging ductwork. We handle every era and every system type.
Owner Chris Elsis Jr. is a Central Florida native. We're not a franchise. We know the difference between a Fern Park ranch home and a Heathrow estate — and we know what each one needs.
You'll get a full, written quote before we start any work. No surprise charges. No upselling. Our diagnostic fee is waived with any completed repair. With 63% of Seminole County homes owner-occupied, we know you're investing in your biggest asset.
We've been solving HVAC problems across Seminole County for over 30 years. From R-22 phase-outs on pre-2010 systems to hurricane-hardened condenser installations, we've handled every challenge this county can throw at us.
Transparency is one of our core values. Here's a general guide to common HVAC service costs in the Seminole County area. Your actual cost depends on your specific situation — we always provide a written quote before starting work.
| Service | Typical Cost Range | What's Included |
|---|---|---|
| AC Diagnostic & Inspection | $89 – $150 | Applied toward repair |
| Common AC Repair | $250 – $800 | Capacitor, fan motor, refrigerant leak |
| AC Tune-Up | $89 – $175 | Includes coil clean & mold check |
| New AC System (installed) | $5,500 – $15,000+ | Load calc, permits, financing available |
| Duct Cleaning | $300 – $600 | Full system cleaning & sanitization |
| Smart Thermostat Install | $150 – $350 | Setup included |
* Prices are estimates for the Seminole County area as of 2026. Actual costs depend on system type, home size, and specific conditions. We provide free, no-obligation quotes for all installations.
Our headquarters on Curry Ford Road puts us minutes away from every corner of Seminole County. Here are the communities we serve with our 90-minute arrival guarantee.
We believe in transparency and education. Here are the most common questions we hear from our Seminole County neighbors.
AC repair across Seminole County typically costs between $250 and $800 for common issues like capacitor replacement, refrigerant leaks, or fan motor failures. At Smart Home Air & Heat, we provide a transparent quote before any work begins, and our diagnostic fee is waived with completed repairs.
Yes. We serve all 309 square miles of Seminole County — every incorporated city (Sanford, Altamonte Springs, Oviedo, Winter Springs, Casselberry, Lake Mary, Longwood) and every unincorporated community (Fern Park, Forest City, Wekiva Springs, Chuluota, Geneva, Heathrow). Our 90-minute guarantee covers them all.
R-22 (Freon) was phased out of production in 2020. If your pre-2010 system still uses R-22, the remaining supply is extremely expensive — often $100–$200+ per pound. We recommend replacing the entire system with a modern R-410A or R-454B unit. The energy savings alone often justify the upgrade, especially with Seminole County's 8–10 month cooling season.
Seminole County is surrounded by massive water systems — Lake Monroe, Lake Jesup (one of the largest in Central Florida), the St. Johns River, and the Wekiva River. These bodies of water create persistently high humidity that forces your AC to work overtime on dehumidification. Attic temps hit 140–160°F county-wide, compounding the problem.
We guarantee a technician at your door within 90 minutes of your call, or you receive $200 off. This covers all of Seminole County — from Sanford in the north to Casselberry in the south, Chuluota in the east to Forest City in the west. Available 24/7 including nights and holidays.
Yes. Seminole County has its own building department with different permit requirements, inspection schedules, and fee structures than Orange County. We handle all Seminole County HVAC permitting for you — from application to final inspection — at no additional charge.
Absolutely. Hurricane-force winds can send debris into your outdoor condenser, and power surges during storms can damage your system's electronics. We recommend a surge protector on your HVAC system, trimming vegetation around your condenser, and having a post-storm inspection plan. Our maintenance plans include hurricane-readiness checks.
Yes. We offer flexible financing for homeowners across all of Seminole County. We work with multiple lenders for low monthly payments and promotional 0% APR periods. A new system typically costs $5,500 to $15,000+ depending on home size and system type.
90 minutes or $200 off — that's our Seminole County guarantee.
Smart Home Air & Heat serves 16+ neighborhoods across Central Florida with the same 90-min guarantee.
Smart Home Air & Heat provides AC repair, installation & HVAC maintenance to all Seminole County zip codes including Sanford, Lake Mary, Longwood, Winter Springs, Casselberry, Oviedo.
Not sure if we serve your area? Call (407) 465-7777 — we likely do!
