How to Leave a Phnom Penh Apartment Empty for Several Months

Prepared by the NovAsia Editorial Team

A Phnom Penh apartment can be left empty for several months, but it should not simply be locked and forgotten. In a tropical climate, the biggest risks are moisture, unnoticed leaks, mould, insects, stale drains, failed equipment and delayed reaction after a power cut. The safest plan reduces the number of devices left running, removes sources of food and humidity, shuts off unnecessary water and gives a trusted local person clear access and authority to act.

A camera is useful, but it is not a caretaker. A humidity sensor is useful, but it does not dry the apartment by itself. The key question is always the same: if something goes wrong, who can enter and what are they allowed to do?

This article is for general information only. It does not replace an inspection by electricians, plumbers, air-conditioning technicians or building management. Before switching equipment off or leaving it running for long periods, check the manufacturer’s instructions and condominium rules.

Start with the actual absence scenario

Two weeks away and four months away are not the same problem. For a short trip, the refrigerator may stay on and normal cleaning may be enough. For a several-month absence, it is often safer to empty the refrigerator, disconnect most appliances, shut off water and arrange periodic inspection.

Another important question is whether anyone will enter the apartment. If nobody can enter for the whole period, the setup should be as passive as possible: minimal running equipment and minimal points of failure. If a trusted person or property manager can inspect every one or two weeks, you can use monitored humidity control, check drains and react to early problems.

Building type also matters. A modern condominium may have security, property management and some technical staff, but that does not mean anyone checks the inside of your apartment. Security usually monitors common areas. In a small building, more responsibility falls directly on the owner or tenant.

Before leaving, answer five questions in writing:

• who may enter the apartment;
• where the main water shut-off is;
• which electrical circuits remain on;
• how humidity is monitored;
• who acts during an emergency.

If any answer is vague, the apartment is not ready for a long absence.

Run a trial before you leave

Do not build the entire system on the last evening. One or two weeks before departure, set up humidity and temperature sensors, check internet connection, test any dehumidifier or air conditioner plan and confirm that notifications reach the right people.

This trial shows how quickly humidity rises after rain, whether a smart plug restarts after a power cut, whether the router reconnects and whether the air conditioner resumes its settings. Many “smart” devices depend on internet access. A sensor that alerts you in another country is only useful if someone nearby can respond.

It helps to live under the planned departure setup for a few days: close some valves, remove stored food, leave only the selected devices on and watch for odours, condensation or errors.

Fix existing problems before the trial. Mould behind a wardrobe, a damp ceiling, a dripping siphon or an air conditioner with a blocked drain will not be solved by installing a sensor. WHO guidance on dampness and mould emphasises preventing persistent moisture and microbial growth. Monitoring is not remediation.

Electricity: what to leave on and what to unplug

There is no universal rule to “turn everything off”. If you switch off the main breaker, the router, camera, sensors, dehumidifier and refrigerator will stop. If you leave the whole apartment powered, unnecessary devices remain connected and create avoidable risk.

Go through the electrical panel and identify circuits. Some apartments have separate breakers for air conditioners, sockets, lighting, water heater and kitchen. If the labelling is unclear, ask an electrician or building technician to verify it.

Only equipment with a clear purpose and a failure plan should remain on.

Unplug televisions, speakers, microwaves, chargers, coffee machines and other small appliances. This reduces the risk of heat from faulty adapters, accidental activation and damage during voltage fluctuations.

Do not run permanent monitoring equipment through a cheap multi-plug overloaded with cameras, routers, sensors and a dehumidifier. Devices intended to operate continuously need suitable sockets and safe wiring. If the apartment wiring is questionable, inspect it before leaving.

Refrigerator, washing machine and other appliances

An empty refrigerator should usually be cleaned, dried, switched off and left slightly open. Some manufacturer instructions, including LG guidance for long absence, specifically recommend disconnecting power and leaving the door open to prevent odour. Always check the manual for the specific model.

The door should be safely held ajar so it cannot close unexpectedly. Shelves and seals must be dry. If the refrigerator has a water connection or ice maker, shut off the water supply.

Leaving a refrigerator on for a few bottles of water is rarely worthwhile. If it contains medicines or other necessary items, install temperature monitoring and consider power-cut risk.

For the washing machine, empty it, clean the filter if accessible, dry the drum and detergent tray, close the water valve and unplug the machine. Leave the door and detergent drawer slightly open for air movement.

For a dishwasher, follow the model’s manual. General manufacturer guidance often includes cleaning it, leaving the door slightly open, disconnecting power and shutting water for long absence. On return, a short empty cycle may be recommended.

Turn off the water heater according to the manual and after considering the water supply. When returning, do not energise a tank-style heater before confirming that water has been restored and the unit is filled, if that is required by the model.

Remove batteries from rarely used remote controls to reduce leakage risk.

Humidity: the main tropical risk

Mould grows where moisture persists. CDC guidance recommends keeping indoor humidity as low as practical and ideally no higher than 50%. In Phnom Penh, maintaining that level throughout an empty apartment may require equipment, so focus on actual readings and preventing prolonged dampness.

One sensor near the entrance does not show conditions behind a wardrobe or in a closed bedroom. A practical minimum is one sensor in the main living area and one in the most vulnerable zone: a shaded bedroom, wardrobe, room without sun or area near an external wall.

High humidity is especially risky for:

• leather shoes and bags;
• books, documents and cardboard;
• mattresses and upholstered furniture;
• wooden cabinets;
• electronics;
• walls behind furniture;
• closed bathrooms.

Do not push wardrobes, boxes or furniture tightly against external walls. Leave space for air movement. Cabinet doors and drawers can be left slightly open if safe.

Textiles should be clean and fully dry. A damp towel, bath mat or sponge can create smell and mould quickly in a closed apartment. Do not seal a mattress in plastic unless it is completely dry and the storage method is appropriate; plastic can trap remaining moisture.

Moisture absorbers can help inside small enclosed wardrobes, but they do not dry an entire apartment. They can fill earlier than expected and spill. Place them in stable trays and do not rely on them as the only protection.

Dehumidifiers and air conditioning

A dehumidifier can work well only if water drainage is safe. A small tank requires regular emptying, so a long absence needs continuous drainage or frequent visits.

The drain hose must not be loose, kinked or simply dropped into a sink where it can shift. Secure it and test it for several days. If it drains into a floor drain, confirm that water actually leaves and does not return.

Clean the filter, place the unit away from walls and keep the cord dry. Do not set it on soft carpet or cover it.

The crucial test is restart after power failure. If the dehumidifier does not resume automatically, remote monitoring must show the stoppage and a local person must be able to enter.

Air conditioning may reduce humidity, but it is not automatically safe to run unattended for months. Before leaving, clean filters, check drainage, inspect for leaks and make sure the external unit is in good condition. If the unit has recently dripped or smelled musty, repair it first.

Do not set a very low temperature to “dry harder”. The goal is humidity control, not cooling an empty apartment. Use a mode supported by the model and measure the result with a separate humidity sensor.

A timer alone is not enough. After heavy rain, a power cut or a change in outside temperature, the apartment may behave differently. Judge by actual humidity, not only by the schedule.

Do not leave windows open while running air conditioning. That brings humid air into the apartment and makes the system work harder.

Water: shut it off, then verify

A small leak in an empty apartment can damage floors, furniture and the unit below. If water is not needed for running equipment, it is usually sensible to close the apartment’s main water valve.

First, find the correct valve. In a condominium it may be in a bathroom, under a kitchen sink, in a utility cupboard or behind a panel in the corridor. Do not close an unknown common-area valve without building approval.

After closing the valve, open a tap and confirm that flow stops. Then close the tap again. If the meter continues moving while all fixtures are closed, investigate before leaving.

Phnom Penh Water Supply Authority accepts customer reports related to leaks and meters. In a condominium, the first contact is usually building management because the problem may be after the building meter or inside the building system.

Also shut off supply to:

• washing machine;
• dishwasher;
• water filter;
• ice maker;
• water heater;
• balcony hose.

Do not leave a hose pressurised just because the appliance is off. Switching off electricity does not shut off water.

Drains, odour and leak sensors

If an apartment is empty for a long time, water in sink, shower and floor-drain traps can evaporate. When the water seal disappears, sewer odour can enter. Before leaving, clean drains and make sure traps contain water.

During inspections, the trusted person should check smell and add a little water to rarely used drains if needed. Do not seal unknown drains without understanding their purpose.

Keep the toilet clean and the lid closed. Do not pour random aggressive chemical mixtures into it before leaving.

A balcony drain should be clear if rain can enter. Leaves, dust or plastic packaging can block drainage.

Place leak sensors under the kitchen sink, near the washing machine, water heater and air-conditioning drain. They should send alerts through working internet or sound a local alarm that a neighbour or security can hear.

A leak sensor alone does not stop water. Automatic shut-off valves may reduce risk, but they should be installed by a competent person and agreed with the owner and building management. Improvised valves can create new problems.

Test every sensor before departure and make sure alerts reach both you and a local contact.

Food, belongings and valuables

The apartment should be clean before being closed. Dust, crumbs, grease and damp textiles attract odours, insects and mould.

Remove food, including open spices, tea, grains and pet food. Airtight containers reduce risk but do not make storage necessary. The fewer food sources remain, the easier pest control becomes.

Clothes should not be packed too tightly. Air should circulate. Shoes should be clean and dry. Do not place documents, photographs, books or cardboard directly on the floor or tight against an external wall.

Important papers should be taken with you or stored in a sealed container with a desiccant and periodic checks. Cash, jewellery, spare keys and small valuables should not be left in obvious drawers. Security staff do not replace secure storage.

Use breathable covers for furniture where needed. Plastic sheeting over wood or fabric can trap moisture. Partly close curtains or blinds to reduce sun damage, but do not block all ventilation.

Access, keys and instructions

Tell building management the period of absence and an active contact. This is especially important for owners who live abroad. If there is a leak, smell of smoke or urgent building repair, management must know whom to call and who may open the apartment.

Do not give the only key to a casual worker. Authorise a specific trusted person and provide their details to security. If an electronic access card is used, check its validity.

The trusted person needs written instructions:

• how to enter;
• where valves are;
• which breaker powers monitoring devices;
• who to call in the building;
• what to photograph;
• when a technician may be called;
• what spending limit is pre-approved.

Without a spending limit, the person may do nothing because they fear spending money, or they may authorise an expensive repair without your approval. A modest emergency reserve helps.

If you use cameras, aim them at the entrance or general area, not at spaces where inspectors may expect privacy. Follow building rules and avoid recording common corridors without permission.

Do not publish your absence dates publicly on social media.

Remote monitoring that actually helps

A useful minimal setup includes humidity sensors, leak sensors, power-status monitoring and one camera. But every alert needs a response plan.

Alerts should go to at least two people: you and someone in Phnom Penh. If only the owner abroad receives alerts, the response may be too slow.

Routers and cameras depend on electricity. A small UPS can keep the network alive during short cuts, but it will not solve a long outage. The UPS itself must be maintained.

Smart plugs can help restart a router, but do not use a small smart plug for high-load equipment unless the manufacturer and an electrician confirm it is appropriate.

Before leaving, simulate a power cut: switch power off briefly, then restore it. Check whether the router reconnects, the camera returns, equipment restarts correctly and alerts arrive.

Inspection frequency

There is no single required schedule. It depends on season, building condition, equipment left running and any insurance or property-management conditions. A practical starting point for a long absence is one visit after a few days, then every one to two weeks.

During the rainy season, after building repairs, after previous leaks or in top-floor units, inspections should be more frequent.

Each visit should follow the same checklist:

1. Record humidity readings.
2. Inspect ceiling and walls.
3. Check the floor near appliances.
4. Look at the water meter.
5. Check drains and odour.
6. Confirm internet and monitoring.
7. Inspect wardrobes and textiles.
8. Take photographs.

Photos should be taken from the same positions each time. This makes slow changes visible.

If humidity keeps rising, do not simply run the air conditioner longer. First look for the source: leak, wet balcony, blocked drain, open air path or dampness behind furniture.

Using building management

Some buildings offer paid apartment checks, bill payment and repair coordination. This can be useful if the service is specific.

Replace “we will keep an eye on it” with a written list:

• how often they enter;
• what they check;
• whether photos are sent;
• whether readings are taken;
• whether drains are refilled;
• how emergency access works;
• what technician calls cost.

Ask who is responsible if a visit is missed. Building management can help, but it may not accept responsibility for everything inside the unit.

For an investment apartment, it may be efficient to combine absence checks with ordinary property management: inspections between tenants, cleaning, small repairs and preparation for the next occupancy.

Tenants should obtain the owner’s consent before installing cameras, automatic valves, changing locks or leaving air conditioning running regularly. Also check whether the lease requires notice of long absence.

Timeline before leaving

Two weeks before leaving, fix leaks, service air conditioners, check electrical circuits and begin testing sensors. Agree access with building management and the trusted person.

One week before leaving, remove food, wash and dry textiles, empty the refrigerator and review wardrobe storage. Check payments for electricity, water, internet and building management fees so that services are not cut off.

The day before departure, do final cleaning, dry bathrooms, disconnect unnecessary devices and photograph meters. Record initial humidity readings.

On the departure day:

• remove rubbish;
• close water;
• check drains;
• confirm windows and balcony doors are closed;
• switch off unnecessary circuits;
• test sensors;
• pass instructions to the local contact;
• record a final video.

Do not do wet cleaning at the last minute. Floors and bathrooms should be dry before the apartment is closed.

Returning after several months

Do not switch everything on immediately. First inspect ceilings, floors, walls, appliances and hidden corners. Notice any musty smell, swelling, insects or water marks.

Open water gradually and watch connections. Check taps, toilets, hoses and the water heater. If a leak appears, close the main valve again.

Ventilate if outside conditions allow. Inspect and clean the air conditioner before heavy use, especially if there is visible mould or strong odour.

Restart appliances according to manufacturer instructions. If the refrigerator was turned off and left dry, inspect it before closing and powering it. Run an empty dishwasher cycle if the manual recommends it.

Review sensor history. The humidity graph from your absence tells you whether the plan worked and what to change before the next trip.

Bottom line

Leaving a Phnom Penh apartment empty safely depends on three things: fewer running devices, moisture control and a real local person with access. Air conditioners, dehumidifiers and sensors can help, but each can fail. The system must have a backup plan.

Before leaving, fix existing leaks, check air-conditioning drains, shut off unnecessary water, unplug appliances, dry textiles and organise regular inspections. The safest empty apartment is not the one with the most gadgets. It is the one with fewer sources of failure and a clear response when the first warning appears.

Sources

1. World Health Organization — WHO Guidelines for Indoor Air Quality: Dampness and Mould. 1 January 2009. Guidance on preventing persistent dampness and microbial growth. Checked 27 June 2026.
2. Centers for Disease Control and Prevention — Mold: Prevention and Cleanup. Updated 26 September 2024. Guidance on humidity control, leak repair and air circulation. Checked 27 June 2026.
3. Phnom Penh Water Supply Authority — official customer information on meters, leak reports and customer service. Checked 27 June 2026.
4. LG Electronics — Refrigerator Owner’s Manual GC-151SA. Care and Cleaning section on preparation for long absence. Checked 27 June 2026.
5. LG Electronics South Africa — How to Clean Your Dishwasher. Guidance on long absence preparation. Checked 27 June 2026.
6. Electrical Safety First — official guidance on washing machines, appliances, residual-current protection and electrical connections. Checked 27 June 2026.

Frequently asked

Can I simply turn off all electricity in the apartment?

Not always. If you need a router, camera, leak sensor, dehumidifier or refrigerator, some circuits must remain on. It is better to disconnect unnecessary appliances and confirm what each breaker controls.

Should I leave the air conditioner running for several months?

Only if there is a clear humidity-control plan, working drainage, a humidity sensor and someone who can enter if the system fails. Unsupervised air-conditioning can create new risks.

How often should someone inspect an empty apartment?

For a long absence, an inspection every one to two weeks is usually practical, plus an extra check after heavy rain or power outages. The exact frequency depends on humidity, equipment and the building condition.