Homeowner's Pre-Installation Checklist — 15 Things to Prepare Before Your Aircond Arrives
Prepare for a smooth aircond installation with this 15-point checklist. From choosing the right position to clearing the work area — everything you need to do before the technician arrives.
15 Things to Prepare Before Your Aircond Installation
A well-prepared installation goes faster, cleaner, and with better results. Our installation specialists have compiled this checklist from 500+ installations — tick off each item before your technician arrives for the smoothest experience possible.
Before Booking (Planning Phase)
✅ 1. Choose the Right HP for Each Room
Measure your rooms (length × width) and use our free BTU Calculator or HP sizing guide to determine the correct capacity. Wrong HP = poor cooling or wasted electricity.
✅ 2. Decide Indoor Unit Positions
For each room, choose where the indoor unit will go. Best positions are:
- Above the bed headboard (bedrooms) — cool air flows over you while sleeping
- Opposite the main seating area (living rooms) — even distribution
- Away from direct sunlight and heat sources
- On a wall with easy access to the outdoor unit position
✅ 3. Choose the Outdoor Unit Position
The outdoor unit needs: shade (or sun shield), 30cm+ clearance all around, accessible for maintenance, away from bedroom windows (yours and neighbours'). See our outdoor placement guide.
✅ 4. Check Your Electrical Capacity
Open your DB box and check: are there spare MCB slots? Is the main supply adequate? For 2.0 HP+ units, you'll need a dedicated circuit. See our old wiring guide if your home is pre-2005.
✅ 5. Plan Pipe Routing
Think about how the copper pipes will run from indoor to outdoor unit. Shorter, straighter runs = less extra pipe cost. Our technician will confirm the best route during the site survey.
Day Before Installation
✅ 6. Clear the Work Area
Move furniture, curtains, and fragile items at least 2 meters away from the planned indoor unit position. Our team brings drop sheets, but clearing the area speeds up work and protects your belongings.
✅ 7. Clear Outdoor Unit Access
Remove plants, pots, laundry, and obstacles from the outdoor unit position. Ensure the technician has clear access to the wall/ledge/balcony.
✅ 8. Inform Building Management (Condo)
If you live in a condo, submit the installation application to your JMB/MC office. Most require 3-7 days advance notice. See our condo rules guide.
✅ 9. Book the Service Lift (High-Rise)
For floors above 5, book the service lift for your installation time slot. Some buildings require 2-3 days advance booking.
✅ 10. Confirm Parking for Technician
Arrange visitor parking or inform security about the technician's vehicle. This saves 15-30 minutes of the technician's time (and your installation time).
Installation Day
✅ 11. Be Present for the Site Survey
The first 15-20 minutes involve a walkthrough where the technician assesses positions, pipe routing, and electrical. Your input on preferences is important at this stage.
✅ 12. Approve the Final Quote
After the site survey, the technician will confirm the final price including any extras (additional pipe, MCB). Approve or discuss before work begins — no surprises.
✅ 13. Keep Children & Pets Away from Work Area
Drilling, pipe cutting, and electrical work create hazards. Keep children and pets in a different room during the 2-3 hour installation.
✅ 14. Test the Unit Before Technician Leaves
Before signing the job card, run the unit and verify:
- Cool air is flowing from the indoor unit
- All fan speeds work (low, medium, high, auto)
- Remote control responds correctly
- No water dripping from indoor unit
- No unusual noises from indoor or outdoor unit
- Outdoor unit fan is running and expelling hot air
✅ 15. Collect Your Job Card & Warranty Details
The job card is your warranty document. It records: unit model, serial number, gas type, pipe length, installation date, and warranty start date. Keep it safe — you'll need it for any warranty claim or future service.
After Installation
- Run the unit for 24 hours to verify stable operation
- Set thermostat to 24°C for optimal comfort and efficiency
- Clean filters every 2-4 weeks
- Book your first professional service in 6 months
- Save our WhatsApp number: +60 18-298 3573 for any future needs
Ready to Book?
Our expert installation team is ready to serve you across KL & Selangor. Same-day available for bookings before 11 AM. From RM 199, transparent pricing, 1-month warranty.
WhatsApp +60 18-298 3573 — tell us your unit type, HP, and area for an instant quote.
Definitions
Key terms in this guide, explained
Short, plain-language definitions of the terms used above — written by the technicians who do the work, not copied from a manufacturer brochure.
What is a BTU in aircond sizing?
BTU per hour measures how much heat a unit removes from a room in an hour. A 1.0 HP wall unit is roughly 9,000 BTU/h and a 1.5 HP is roughly 12,000 BTU/h. Room area sets the baseline, then you add capacity for west-facing windows, a top-floor ceiling, high occupancy or kitchen heat.
Oversizing is a real mistake: an over-large unit hits temperature fast, short-cycles, and leaves the room cold but damp.
What is the correct electrical setup for one aircond?
The isolator is the local switch that cuts power to one aircond so a technician can work on it safely; the MCB is the circuit breaker in the distribution board that protects that circuit against overload and short circuit. Each unit should sit on a correctly rated circuit — sharing a lighting circuit or running off an extension lead is both a nuisance-trip and a fire risk.
Repeated tripping is a wiring or capacity problem to investigate, never something to fix by resetting the breaker harder.
What is inside the outdoor unit?
The outdoor unit holds the compressor, the condenser coil and the fan that blows heat away from the coil. It can only reject heat if air moves freely through the fins, so a coil packed with dust, a unit boxed into a tight service yard, or a hot wall right behind it all raise running pressure and electricity use.
Leave at least 30 cm of clear air behind the condenser and never enclose it in a sealed cabinet or grille box.
Quick answer
KL Renovator's practical answer: Prepare for a smooth aircond installation with this 15-point checklist. From choosing the right position to clearing the work area — everything you need to do before the technician arrives.
Reader FAQs
Ready to Book?
Our expert installation team is ready to serve you across KL & Selangor. Same-day available for bookings before 11 AM. From RM 199 , transparent pricing, 1-month warranty. WhatsApp +60 18-298 3573 — tell us your unit type, HP, and area for an instant quote.
Reviewed by real technicians
KL Renovator's HVAC Expert Team
This article links back to the same field team that services wall-mounted, ceiling cassette and window units across KL & Selangor. Meet the 4 real technicians behind KL Renovator, see their experience, and review our service standards before you book.
