Domakihub Clean Your Split AC Before Summer and Cool Smarter
A practical pre-season maintenance routine that keeps your unit running efficiently through Greece's hottest months.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
When temperatures spike in Greece, a neglected split AC works twice as hard and half as well — drawing more power, struggling to hit your target temperature, and sometimes failing entirely at the worst possible moment. The video above walks through the full maintenance process on a real unit; the steps below translate that into a clear checklist you can follow at home, in your holiday rental, or across a hotel floor before the first heatwave arrives. Thirty minutes of attention in May will save you a service call in August.
Why Pre-Season Cleaning Actually Matters
Over a Greek winter, dust, mould spores, and insects accumulate inside the indoor unit. When you switch the AC on for the first time in summer, that debris gets blown straight into the room — and, more critically, insulates the evaporator coils so they cannot absorb heat efficiently. Your electricity bill rises, cooling capacity drops, and the compressor runs longer cycles that accelerate wear.
For holiday rentals and hotels the stakes are higher. A unit that smells musty or drips condensate onto the floor drives negative reviews and demands emergency call-outs at peak-season rates. A single annual clean, done before season, eliminates most of these risks at negligible cost.
What You Will Need
You need no specialist equipment for a basic clean: a soft brush or vacuum with a brush attachment, a spray bottle with a 1:1 white-vinegar-to-water solution (or a dedicated no-rinse AC coil cleaner), warm water, a dry microfibre cloth, and a thin flexible brush or pipe cleaner for the condensate drain. If you want to go further — as shown in the video above — a coil-cleaning foam spray and a fin comb for straightening bent aluminium fins are useful additions.
Always switch the breaker off before opening the indoor unit, not just the remote. Many units remain in standby and carry live voltage even when the display is off.
The 5-Step Pre-Summer AC Clean
- 1
Switch Off Power and Open the Indoor Unit
Turn the unit off at the wall breaker — not only via the remote — then lift the front panel of the indoor head unit. Most split ACs have two plastic latches on the underside of the panel; press them inward and hinge the panel upward until it locks open. Take a photo before you touch anything so you have a reference for reassembly.
- 2
Remove, Wash, and Dry the Air Filters
Slide both mesh filters out of their tracks. Take them to a sink and rinse under warm running water, working from the clean side through to the dirty side so debris does not get pushed deeper into the mesh. For heavier build-up, use a soft brush and a drop of dish soap. Shake off excess water and leave the filters flat in the shade to dry completely — reinstalling damp filters invites mould.
- 3
Clean the Evaporator Coils and Fins
With the filters removed you can see the aluminium fin coil behind them. Use a soft brush or a vacuum on low suction to remove loose dust. Then apply a no-rinse evaporator coil cleaner (or your vinegar solution) by spraying across the full width of the coil from top to bottom. The cleaner loosens grease and mould; most no-rinse formulas drip down into the condensate tray so you do not need to wipe the coil. If any fins are visibly bent, gently straighten them with a fin comb — even a few crushed fins meaningfully reduce airflow.
- 4
Flush the Condensate Drain
The condensate drain is the small pipe — usually 16–20 mm in diameter — that carries the water the coil extracts from the air down and out of the building. Over winter, algae and biofilm build up inside it. Locate the drain tray beneath the coil and pour a cup of diluted white vinegar directly into it, letting it run down the pipe. Then push a thin flexible brush or pipe cleaner into the drain outlet to break up any blockage. A blocked drain is the most common cause of water dripping from the indoor unit onto walls or furniture.
- 5
Wipe Down the Casing and Test the Unit
Wipe the outer casing, louvres, and the inside of the front panel with a damp microfibre cloth. Reinsert the dry filters, close the panel, restore power, and run the unit on cool at its lowest temperature setting for five to ten minutes. Listen for unusual rattles, check that cold air flows evenly across the full width of the louvre, and confirm that condensate water is draining outside rather than pooling inside. If the unit produces a musty odour on first start, run it on fan-only mode for fifteen minutes to dry the coil before switching to cooling mode.
Rather have a pro handle it?
Get a vetted handyman pro in your city — one number, booked in EN/EL/DE.
FAQ
- How often should I clean my split AC filters in Greece?
- In a typical Greek household, once a month during the peak cooling season (June–September) is enough. Holiday rentals and hotels with high occupancy should clean filters every two to three weeks, since more people means more dust, hair, and cooking particles circulating through the air.
- Can I use any household cleaner on the evaporator coils?
- Avoid bleach, harsh acids, or general-purpose kitchen sprays — these can corrode the aluminium fins and void your warranty. A 1:1 white vinegar and water solution is safe for occasional use. For a more thorough clean, buy a product specifically labelled as a no-rinse evaporator coil cleaner; these are formulated to lift biofilm without damaging the fin material.
- What if the AC still smells or drips after cleaning?
- A persistent musty smell usually means mould has colonised the blower wheel — the cylindrical fan that sits behind the coil. This requires disassembly beyond a standard filter clean and is best handled by a technician. Persistent dripping after clearing the condensate drain often points to a blocked or incorrectly pitched drain pipe outside the building, which also warrants a professional inspection.