Getting your AC ready for a Nellore summer: the March checklist

Summer in Nellore is not a gradual thing. There is a week in March when the afternoons go from warm to hostile and every AC in the district is switched on, and the ones that were not ready fail in the same fortnight. The work that prevents that is done in February and early March: a proper service, a check of the outdoor unit and the stabiliser, and a few changes to the room itself.

Here is the checklist in the order that matters.

1. Book the pre-summer service

This is the one non-negotiable item. A service at ₹399 washes the indoor coil and filters, hoses through the outdoor coil, flushes the drain, reads the gas pressures and checks the capacitor and connections. After a winter of light use and a monsoon of humidity, the indoor coil is carrying a film of dust and growth that will cut airflow just when you need all of it.

Do it early. If the service finds low gas, the leak can be fixed and the unit recharged (₹700 for a split) in the same visit or the next one, before the heat arrives. If it finds a weak capacitor, that is a small part at MRP now rather than a dead outdoor unit on the first 42°C evening.

2. Look at the outdoor unit

Go and stand next to it with the AC off at the MCB.

• Clear around it. Anything within a foot or two — plants, cylinders, stacked furniture, a tarpaulin, a parapet too close to the fan — blocks the air it needs to dump heat.
• Check the fins. Matted with dust or cotton fluff, they need the wash that comes with the service. On the coastal side, a white crust means corrosion and the fins should be rinsed with plain water more often.
• Shade it if you can. A unit in direct west sun on a terrace is starting from a disadvantage. A small shade above it with open sides helps. Do not wrap or box it; airflow beats shade.
• Check the mounting. A bracket that has rusted or loosened will vibrate more as the fan runs harder, and vibration cracks joints and leaks gas.

3. Test the stabiliser

Nellore's summer evenings bring voltage dips just when every AC in the street starts up. A compressor that starts fine at noon may hum and fail at 7 pm on a sagging supply, and repeated failed starts are how capacitors and compressors die.

If you have a stabiliser, check that its indicator lights show it is switching, that the cable and plug are not warm after an hour of running, and that it is rated for your unit — a 1.5-ton split usually needs one in the 4 kVA class; check the AC's manual for the current it draws. If you do not have one, this is the cheapest protection you can buy for the most expensive part of the AC. Many inverter units quote a wide operating voltage range, but the spikes when the power returns after a cut are a separate risk the stabiliser also catches.

4. Fix the room, not just the machine

An AC in a room that leaks heat runs all night and never gets there.

• West and south windows take the afternoon sun. A thick curtain or a blind drawn from 2 pm keeps the room several degrees cooler before the AC even starts.
• Door gaps. A towel or a draught strip under the bedroom door stops cool air walking out and hot air walking in.
• Ceiling fan on low. It spreads the cool air so 25°C feels like 23°C and the compressor cycles less.
• Heat sources. A fridge in the bedroom, a computer left on, or a geyser cupboard that shares a wall all add to the load.
• Top-floor rooms under a concrete roof carry the day's heat into the night. A roof that is painted white or kept wet in the evening makes a real difference.

5. Set it sensibly

Start the AC at 24–26°C, fan on Auto or Medium, louvres pointing slightly up so the cool air falls. Setting 18°C does not cool faster; the compressor runs at the same rate until it hits the target, and a lower target just means it never switches off. In Nellore's humidity, Dry mode for the first half hour on a sticky evening often makes the room comfortable faster than Cool mode at a low setting.

6. Know what a struggling AC sounds like

Once the heat is on, watch for the early signs that something was missed: cooling noticeably weaker than last April, the outdoor unit cycling on and off every few minutes, ice on the thin copper pipe, or the unit only misbehaving in the evening. Any of those is a reason for a diagnosis visit (₹350) before the unit stops altogether in May, when the wait for anyone is longest.

The short version

Service in February or March. Clear and shade the outdoor unit. Test or buy the stabiliser. Block the afternoon sun and the door gap. Set 24–26°C with the fan on. Do those five and the AC will do the sixth, which is cool the room on the first hot night.