The repair-versus-replace decision for an RV rooftop AC in Miami comes down to the unit's age and which component has failed. For units under 7 years old with a failed capacitor or fan motor, repair is almost always the right call - these are $85-260 repairs that restore full cooling for several more seasons. For units that are 8 years or older and have experienced a compressor failure, the calculation changes.
The compressor is the most expensive AC component to replace ($400+ in parts alone), and a compressor that fails at age 9 in Miami conditions typically means the surrounding components - capacitors, fan motors, coil surfaces - have accumulated equivalent wear. Replacing only the compressor buys 1-2 seasons at most before the next major component fails. Replacement at $650-850 installed provides a factory-warrantied unit for the next 8-10 years.
We give every customer an honest assessment on-site. If you describe the symptoms on the phone and tell us the unit's age, we can usually tell you before we arrive whether repair or replacement is the more likely recommendation.
Dometic Blizzard NXT vs. Coleman-Mach 8 for Miami
Marcus Reyes at a Miami-Dade service call.
The two replacement units we install most in Miami-Dade are the Dometic Blizzard NXT and the Coleman-Mach 8. Here is how we choose between them for specific RVs.
The Dometic Blizzard NXT at 15,000 BTU with an improved SEER rating versus the standard Brisk Air is our default recommendation for Class A and Class C motorhomes in Miami. It handles high ambient temperatures better than the Brisk Air because its evaporator coil design provides more heat exchange surface area relative to the compressor size.
The trade-off is slightly higher upfront cost and a unit profile that is approximately 1 inch taller than the Brisk Air. If the RV has a height-sensitive storage situation, we confirm clearance before ordering.
The Coleman-Mach 8 in the low-profile configuration at 13,500 BTU is the better choice for travel trailers and fifth wheels with interior ceiling height constraints. At approximately 7 inches interior profile versus 9-10 inches for standard units, it fits spaces where a Dometic would require trim modification.
It is also about $50-80 less expensive installed. Its fan motor housing is slightly more strong than the Dometic equivalent in our experience, which matters in Miami salt-air conditions.
The Roof Sealing Step - Why It Is Not Optional
Marcus Reyes at a Miami-Dade service call.
Every rooftop AC replacement we perform includes a complete reseal of the unit base with Dicor self-leveling lap sealant and EternaBond tape on the critical front and rear seam edges. This step is not optional and is not something to defer - an AC unit installed without correct base sealing is a guaranteed roof leak within the first Miami rainy season.
We have repaired multiple roof leaks on RVs where a previous shop installed a replacement AC and skipped or shortcut the sealing step. The additional 30 minutes of sealing work prevents a $250-3,000 water damage repair.
After sealing, we run the unit under full load for a minimum of 20 minutes before leaving. We verify discharge air temperature reaches below 55 degrees Fahrenheit at the grille (indicating full compressor engagement), that the fan moves adequate air volume at all speed settings, and that the thermostat is reading correctly. We do not consider the installation complete until these checks pass.
2026 Rooftop AC Unit Replacement Pricing - Miami, FL
Rooftop AC Unit Replacement - Miami-Dade 2026
Service
Miami Avg. Range
Time On-Site
Dometic Blizzard NXT installed
$650 - $850
3-4 hrs
Coleman-Mach 8 (low-profile) installed
$600 - $800
3-4 hrs
Dometic Penguin II (van/compact) installed
$550 - $750
3-4 hrs
Roof reseal included with installation
Included
In installation time
Old unit refrigerant recovery and disposal
Included
During removal
Pricing disclaimer: Figures shown are local averages for planning. Final price determined on-site by your technician after diagnosis.
We provide a flat-rate quote before any work begins - that number is your invoice. Call (305) 912-8800.
Common Rooftop AC Unit Replacement Issues in Miami
RV air conditioning failures in Miami follow the summer heat pattern. Capacitor burnouts are the most common call from June through September when AC units run continuously in Miami-Dade County's heat.
Low refrigerant from storage-related seal degradation and condenser coils coated with dust and debris from campsite roads are the next most common issues. The first camping trip after winter storage often reveals AC problems that developed during months of system inactivity - the seals dry out slowly and the charge leaks through micro-cracks that are invisible without a pressure test.
Miami and Miami-Dade County RV owners face the same Florida climate challenges as the rest of Central Florida, with year-round heat, high humidity, and a June through September storm season that creates specific wear patterns on RV systems. Rigs stored outdoors in Miami-Dade County between trips experience UV degradation on roof seals and awnings, battery drain from inactivity, and generator fuel varnish from ethanol-blend gasoline left standing in the tank. Those are the conditions that drive most of the service calls we handle in Miami.
How Our Rooftop AC Unit Replacement Service Works in Miami
Marcus starts every AC call with a full system check under load - refrigerant pressure, compressor amperage, fan motor condition, and coil cleanliness - before recommending any repair. That approach catches the cases where a "cooling problem" is actually a dirty condenser coil that blocks airflow, not a refrigerant leak, and prevents unnecessary refrigerant recharge charges. Most common AC repairs are completed same-visit from parts stocked on the van.
Mobile service means no towing costs and no shop wait. We come to campgrounds including Larry and Penny Thompson Memorial Park, Everglades National Park (Flamingo and Long Pine Key campgrounds), Biscayne National Park, Mack's Fish Camp in Homestead, Homestead Bayfront Park, as well as storage facilities and private residences throughout Miami-Dade County. Call (305) 912-8800 or use the contact form to schedule service.
We confirm appointments within 2 hours during business hours (Monday through Saturday, 7am to 7pm). Emergency response is available 24 hours a day for safety-related situations.
What to Have Ready When You Call
Before calling, note what the thermostat reads versus what you feel inside the rig. If the air handler runs but the air is not cool, that points to a refrigerant or compressor issue. If the unit makes noise but no air moves, that points to a fan motor or airflow problem.
If the unit does not run at all, check the breaker first. Have the rig year, make, and model ready when you call, and the AC unit model if you can get to the cover label.
Common Rooftop AC Unit Replacement Issues in Miami
RV air conditioning failures in Miami follow the summer heat pattern. Capacitor burnouts are the most common call from June through September when AC units run continuously in Miami-Dade County's heat.
Low refrigerant from storage-related seal degradation and condenser coils coated with dust and debris from campsite roads are the next most common issues. The first camping trip after winter storage often reveals AC problems that developed during months of system inactivity - the seals dry out slowly and the charge leaks through micro-cracks that are invisible without a pressure test.
Miami and Miami-Dade County RV owners face the same Florida climate challenges as the rest of Central Florida, with year-round heat, high humidity, and a June through September storm season that creates specific wear patterns on RV systems. Rigs stored outdoors in Miami-Dade County between trips experience UV degradation on roof seals and awnings, battery drain from inactivity, and generator fuel varnish from ethanol-blend gasoline left standing in the tank. Those are the conditions that drive most of the service calls we handle in Miami.
How Our Rooftop AC Unit Replacement Service Works in Miami
Marcus starts every AC call with a full system check under load - refrigerant pressure, compressor amperage, fan motor condition, and coil cleanliness - before recommending any repair. That approach catches the cases where a "cooling problem" is actually a dirty condenser coil that blocks airflow, not a refrigerant leak, and prevents unnecessary refrigerant recharge charges. Most common AC repairs are completed same-visit from parts stocked on the van.
Mobile service means no towing costs and no shop wait. We come to campgrounds including Larry and Penny Thompson Memorial Park, Everglades National Park (Flamingo and Long Pine Key campgrounds), Biscayne National Park, Mack's Fish Camp in Homestead, Homestead Bayfront Park, as well as storage facilities and private residences throughout Miami-Dade County. Call (305) 912-8800 or use the contact form to schedule service.
We confirm appointments within 2 hours during business hours (Monday through Saturday, 7am to 7pm). Emergency response is available 24 hours a day for safety-related situations.
What to Have Ready When You Call
Before calling, note what the thermostat reads versus what you feel inside the rig. If the air handler runs but the air is not cool, that points to a refrigerant or compressor issue. If the unit makes noise but no air moves, that points to a fan motor or airflow problem.
If the unit does not run at all, check the breaker first. Have the rig year, make, and model ready when you call, and the AC unit model if you can get to the cover label.
Q & A
Rooftop AC Unit Replacement in Miami - Questions and Answers
How long does rooftop AC replacement take?
3-4 hours at your Miami-Dade location from van arrival to unit running under verified load. We work at your driveway, campground, or storage facility.
What size AC unit do I need for my RV?
We size based on your coach length and insulation. Most coaches under 35 feet do well with a single 13,500 BTU unit in Miami.
Coaches 35-45 feet often benefit from a second zone. We assess on-site.
What is the warranty on a new rooftop AC?
Dometic and Coleman units carry standard manufacturer warranties, typically 1 year parts and labor. Our installation labor is warranted for 30 days. We handle any warranty claims with the manufacturer on your behalf.
Does the installation include resealing the roof?
Yes, always. Dicor lap sealant around the full base perimeter plus EternaBond tape at the critical seam edges. An unsealed AC base is the most common source of roof leaks on RVs where the unit was recently replaced.
Can you replace the AC at a campground or storage facility?
Yes. All rooftop AC replacement at your location across Miami-Dade.
Should I schedule replacement now or wait until my current unit fails?
If your unit is over 8 years old in Miami conditions and showing any capacity reduction, scheduling proactive replacement in fall or spring avoids being without AC in peak Miami summer heat. We can assess your current unit on-site.
Can you replace only the rooftop unit and reuse the interior air handler?
Yes in most cases. If the interior shroud and air handler are in good condition, we reuse them. If the unit brand is changing (Dometic to Coleman or vice versa), the interior assembly may need to change as well - we confirm during the pre-order assessment.
What happens to the old unit's refrigerant?
We recover all refrigerant using EPA 609 certified equipment and dispose of it correctly. We never vent refrigerant to atmosphere.
RV broken in Miami? We come to you.
Same-day across Miami-Dade. Flat-rate before dispatch.
