If you’re running a PTAC unit, you know it’s the workhorse that keeps your space comfy year-round. But like any workhorse, it needs regular TLC to avoid breakdowns and keep chugging along for years. After two decades in the trade, I can tell you straight: preventive maintenance isn’t optional if you want your PTAC to last beyond a few seasons.
Here’s how to keep your unit running strong without breaking the bank or your back.
1. Regular Filter Cleaning and Replacement
Dirty filters are the #1 cause of PTAC problems. When filters get clogged with dust and debris, airflow drops, causing the unit to overheat or freeze up.
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Clean reusable filters every month during heavy use
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Replace disposable filters every 3 months or as recommended by your unit’s manual
If you’re not sure about your filter type, check the manufacturer’s guide or look for replacement filters online from trusted HVAC suppliers.
Keeping filters clean reduces strain on your blower motor and heat components.
2. Clean the Evaporator and Condenser Coils
Coils are where the magic happens—transferring heat in or out of your space. Dirt buildup on coils lowers efficiency and forces your PTAC to work harder.
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Vacuum coils gently every 6 months
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Use a no-rinse coil cleaner if you spot stubborn grime
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Be careful not to bend or damage the coil fins
Dirty coils mean higher energy bills and faster wear on your compressor and fan motors.
3. Inspect and Clear Drainage
PTAC units produce condensation that needs to drain properly. A clogged drain pan or tube can cause water leaks, mold growth, and even damage electrical components.
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Check drain pan for standing water monthly
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Use a small brush or compressed air to clear drain tubes
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Ensure the unit is tilted slightly to allow water to flow out
If you notice persistent water pooling or musty smells, it’s time for a professional inspection.
4. Check Electrical Components and Connections
Loose or corroded electrical connections can cause intermittent problems or total failure.
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Turn off power before inspecting wiring inside your unit
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Look for burnt wires, loose terminals, or corrosion
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Tighten any suspect connections carefully
If you’re not comfortable working with electrical parts, hire a licensed technician to do an annual inspection.
5. Test the Thermostat and Controls
A misbehaving thermostat can cause your PTAC to cycle incorrectly or not heat/cool at all.
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Test thermostat accuracy with a separate thermometer
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Replace batteries or clean contacts as needed
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Calibrate or upgrade the thermostat if it frequently malfunctions
6. Lubricate Moving Parts if Applicable
Older PTAC units may have motors or fans that require periodic lubrication.
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Check your unit’s manual to see if lubrication is recommended
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Use the right type of oil and apply sparingly
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Avoid over-lubricating, which can attract dust
7. Schedule Annual Professional Maintenance
Some things are best left to the pros, especially if your PTAC unit is under warranty.
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Have a certified HVAC technician inspect refrigerant levels, electrical components, and heat elements yearly
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Early detection of issues can save costly repairs later
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Ask about seasonal tune-up packages to keep maintenance affordable
Why Preventive Maintenance Pays Off
I’ve seen countless PTACs come in for repairs that could have been avoided with simple upkeep.
Regular maintenance means:
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Lower energy bills due to efficient operation
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Longer equipment life, avoiding early replacements
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Fewer emergency breakdowns on the coldest or hottest days
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Improved air quality and comfort
Tony’s No-BS Advice
Keep your PTAC unit in tip-top shape with the basics: clean filters, clear coils, proper drainage, and regular checks.
If you’re the mechanically curious type, learn your system’s ins and outs—it pays off.
But don’t ignore signs of trouble or delay professional service if needed. Your PTAC will thank you by running reliably season after season.
In next article read about: Choosing the Right Replacement PTAC Unit: Tony the Trusted Tech’s Expert Buying Guide
