Expert repair for compact RV air conditioners. Dometic Cool Cat and other space-efficient AC systems for small travel trailers and B-class motorhomes. RVTI-certified technicians.
Under-bunk AC units are compact air conditioning systems designed for small travel trailers and B-class motorhomes where space is limited. Despite the name, these units can be mounted under bunks, under cabinets, in walls, or above bunks—wherever your RV's design allows. The Dometic Cool Cat series is the most common type.
"Under-bunk" is a bit of a misnomer—these compact AC units can be installed in multiple locations:
Location depends on your RV's layout, available space, and cooling needs.
Under-bunk AC units are perfect when:
Common in: Small travel trailers, compact campers, B-class motorhomes, van conversions
The Dometic Cool Cat series is the most common under-bunk AC system. Our RVTI-certified technicians service all compact RV air conditioner brands.
The most popular under-bunk AC system. Available in various BTU capacities for different RV sizes. Reliable cooling in a compact package.
We stock common Dometic Cool Cat parts and can diagnose any issue with these systems.
Various manufacturers make compact, space-efficient AC units for small RVs. As RV AC experts, we can diagnose and repair any brand.
Have a different brand? Bring it in—we've likely seen it and can help.
RV not cooling despite AC running?
We diagnose the root cause, not just symptoms.
AC completely dead?
Systematic electrical diagnosis finds the problem fast.
Louder than normal operation?
We identify noise sources and resolve them.
Water inside RV from AC?
We locate the source and fix it properly.
Ice forming on unit?
Proper diagnosis prevents recurring freeze-ups.
Unit runs but can't keep up?
We assess capacity needs and recommend solutions.
Before assuming your AC needs replacement, run this simple test to determine if the unit itself is working properly.
✓ If difference is 16°F or more → AC is working properly
The air conditioner unit itself is doing its job. If RV isn't cool enough, the issue is elsewhere (insulation, undersized unit, etc.)
✗ If difference is less than 16°F → AC needs service
The unit isn't cooling air adequately. Could be dirty coils, failed compressor, or any number of other AC-specific issues requiring professional diagnosis.
Just changing an air conditioner is the most expensive test. If the first one was working properly, the second one probably won't do any better.
Many RV cooling complaints aren't the AC itself—they're poor insulation, undersized units for the space, or excessive heat load. Proper diagnosis saves you money by fixing the actual problem, not replacing working parts.
You extend your AC's life and maintain peak cooling with regular maintenance. Manufacturers recommend this schedule:
Clean air filters. Manufacturer's #1 recommendation. Dirty filters restrict airflow, reduce cooling, and cause freeze-ups.
Takes 5 minutes. Remove filter, rinse with water, let dry, reinstall.
Keep intake and exhaust vents clear. Under-bunk units can have restricted airflow from bedding, storage items, or debris.
Ensure nothing is blocking vents during operation.
Full AC service minimum once per year. Professional cleaning of coils, inspection of all components, electrical testing, and refrigerant check.
Best done before camping season starts (March-April).
Service twice per year if you camp in dusty conditions like dirt track racing, desert camping, or unpaved campgrounds.
Dust clogs coils faster, reducing efficiency.
Under-bunk units work well for the small RVs they're designed for. Cooling capacity depends on unit BTU rating and RV size. For larger trailers or motorhomes, roof-mounted AC systems typically provide better coverage.
Depends on the issue and age. Capacitors, thermostats, and minor repairs are usually cost-effective. If compressor fails on an older unit (10+ years), replacement may make more sense. We give you the information to decide—no pressure either way.
Depends on available space and your RV's electrical capacity. Larger units require more BTUs and more power. We can assess your situation and recommend appropriate capacity upgrades if space and electrical allow.
We stock common parts for Dometic Cool Cat and other compact AC systems. For less common parts, we can order direct from manufacturers for quick turnaround. Most repairs don't require long waits for parts.
From Dometic Cool Cat to other compact systems—you get accurate diagnosis and genuine repairs. RVTI-certified technicians. Serving North Central Alabama since 1993.