Delhi ACs sit idle for four or five months a year. In that time dust settles inside them, remote cells corrode, drain lines silt up, birds occasionally nest in the outdoor unit, and small faults that were quietly developing last September wait for you.
Then the first hot week arrives, the whole city switches on at once, and anyone who needs help joins a queue in a hot room. The fix is boring and it works: wake the machine up in March, while nothing depends on it.
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In this guide
1. The half-hour you can do yourself
Switch the AC off at the wall before opening anything. None of this needs tools beyond a cloth and a torch.
- Take the winter cover off, indoors and out. Then leave it off. A cover left on an outdoor unit in summer is the single easiest way to choke it.
- Wash the filters. Slide them out, rinse under a tap, dry fully in the shade, refit. Do this even if you cleaned them in October, because idle units collect dust too.
- Fresh cells in the remote. And check the battery compartment for white or green crust from cells left in all winter, which is the commonest reason a remote is dead in March. Clean the contacts until the metal is bright.
- Look inside the outdoor unit’s grille. Leaves, plastic bags, dust packed into the fins, and occasionally a nest. Clear anything loose by hand with the power off, and never bend the delicate fins.
- Clear the space around the outdoor unit. Whatever got stacked there over winter — cartons, a cycle, a water drum — needs to move. It needs free air in and out.
- Check the drain pipe outlet. Find where it ends and make sure nothing has blocked or crushed it, and that it still points somewhere sensible.
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Get free quotes2. Do a proper test run — and listen
This is the part people skip. Run the AC for a full half hour in March and pay attention to it, because everything it is going to do wrong in May it will hint at now.
- Set it to cooling, a low temperature and high fan, and let it run thirty minutes. Ten minutes is not enough to reveal anything.
- Feel the air. It should be properly cold, not merely moving. Weak or lukewarm air after half an hour is a cue to book a service now rather than in May.
- Listen at the outdoor unit. A steady hum is right. Rattles, grinding, screeching or a compressor that strains on start-up are all worth acting on in March. Our guide on an AC making a loud noise explains what the sounds mean.
- Watch for water in the wrong place. A drip inside the room means the drain is blocked or the unit is off-level. See our guide on the AC leaking water indoors.
- Smell it. A few minutes of hot dust smell on the first run of the season is normal and clears. A musty smell that stays is grime on the coil, and a burning smell means switch off at the MCB and call someone before running it again.
- Watch the MCB. If the breaker trips on start-up or after twenty minutes, deal with it now — our guide on the AC that trips the MCB covers what the timing tells you.
3. What to ask a technician for, and when
Book the pre-season service in February or March. Technicians have open calendars, so the job gets done properly rather than in twenty rushed minutes, and you are not negotiating in the middle of a heatwave.
- Ask for a wet clean, not a wipe. A jet or foam wash of the indoor coil and the outdoor condenser is what actually restores cooling. Say the words when you book, because a quick service often means filters only.
- Ask for the blower wheel and the drain line. The blower collects a felt of dust that quietly kills airflow, and the drain line should be flushed through and confirmed dripping freely outside.
- Ask for a general electrical check. Connections, the plug top and socket, and the stabiliser. Loose or heat-damaged connections show up as summer faults.
- Do not accept a gas refill as routine. Refrigerant circulates in a sealed system and is not consumed, so a healthy AC does not need topping up every year. If low gas is claimed, the only useful question is where the leak is — our guide on AC gas refill in Delhi NCR explains why.
- Get quotes on any real fault now. A part sourced in March arrives faster and the technician is not juggling six other jobs. Our AC service cost guide sets out what drives the price so you can judge a quote.
4. Prepare the room, not just the machine
Half of what makes a Delhi room hot has nothing to do with the AC, and March is the time to deal with it.
- Sort out the west-facing window. Heavy curtains, a blind, or a reflective film cuts the afternoon heat load before the AC has to remove it. This matters most on the top floor and in west and south-facing rooms.
- Seal the obvious gaps. Under doors, around window frames, and the wall hole where the copper pipe passes through. Cool air leaking out is cooling you paid for.
- Check the ceiling fan works. Running a fan on low with the AC lets you sit comfortably at a higher setting, which is the easiest saving on a summer bill. Our AC electricity saving tips cover the rest.
- Think about the top floor specifically. A bare concrete roof radiates heat into the room until late at night, and it is why the same AC struggles upstairs and copes downstairs. Shading or covering the terrace helps more than anything you can do to the machine.
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When should I get my AC serviced before summer in Delhi?
What should I check on my AC after winter?
My AC smells when I first switch it on in March. Is that normal?
Does my AC need a gas refill every year before summer?
How we put this guide together
This guide is compiled from common Delhi NCR service patterns and reviewed by the XpertWorker team. XpertWorker connects you with independent, local professionals — we never charge you a paisa, and each professional sets their own price and quotes you free.