Mosquito Nets vs Repellent: What Works Where

A white mosquito net draped over a wooden bed in a sunlit tropical guesthouse room with palm leaves visible through the open window

TL;DR — key takeaways

  • Nets and repellent solve different halves of the same problem: a net protects you while you sleep, repellent protects you while you are awake and moving.
  • Malaria mosquitoes (Anopheles) bite mainly between dusk and dawn, which is why WHO treats insecticide-treated nets as a core malaria intervention. Dengue and Zika mosquitoes (Aedes) bite in daylight, when a net over the bed does nothing at all.
  • A net only works if it is intact, tucked in and not pressed against your skin — most net failures are hanging failures, not mesh failures.
  • In an air-conditioned, well-screened room a net is often unnecessary; in an open-sided lodge, a tent or a fan-cooled room with gaps, it is the single best thing you can carry.
  • For most trips the honest answer is both: a net at night, skin repellent from late afternoon onwards.

People tend to argue about mosquito nets and repellent as if you have to pick one. You do not. They cover different times of day, different mosquito species and different rooms, and the useful question is not which is better but which is doing the work right now. Here is where each one earns its place, and where it quietly does nothing.

Why the time of day decides everything

Mosquito species keep different hours, and that single fact explains most of the confusion.

  • Night biters. Anopheles mosquitoes, which transmit malaria, feed mostly from dusk until dawn — while you are asleep and unable to reapply anything. This is the gap a net fills.
  • Day biters. Aedes aegypti and Aedes albopictus, which transmit dengue, chikungunya and Zika, are aggressive daytime feeders with peaks in the early morning and late afternoon. A net over your bed is irrelevant to them.
  • Dusk and dawn generalists. Culex mosquitoes, the main West Nile vector in Europe, bite around and after sunset — the window when most people are on a terrace, not in bed.

So the net covers the sleeping hours; skin repellent covers everything else. If you are travelling somewhere with both malaria and dengue risk, you need both — and that is the ordinary case in much of Southeast Asia, West Africa and Latin America, as we set out in our guide to mosquito-borne diseases in Southeast Asia.

What a mosquito net actually does

A net is a physical barrier, so it has no reapplication interval, no smell and no concentration to worry about. Insecticide-treated nets (usually long-lasting insecticidal nets, or LLINs) add a treated mesh that also kills or repels mosquitoes landing on it, which is why WHO recommends them as a primary tool for malaria control rather than merely a comfort item.

Two practical specifications matter when you buy one:

  • Mesh density. Look for roughly 156 holes per square inch — fine enough to stop mosquitoes without becoming stiflingly hot. Finer mesh also helps against sandflies and midges.
  • Shape. Box or wedge nets hang away from the body and are the most comfortable. Conical nets are lighter and pack smaller but tend to touch you at the shoulders — and a mosquito can bite straight through mesh resting on skin. Self-supporting pop-up nets are best for camping and floor-level sleeping.

The failure modes are almost always practical. Tuck the net fully under the mattress or sleeping mat, check the mesh for tears and burn holes before you sleep, and stay away from the walls of the net. If you cannot hang it properly, a free-standing pop-up net beats a bad rigging job.

What repellent does that a net cannot

Repellent goes where you go. It protects you on the terrace at sunset, on the walk back from dinner, in the garden, at the bus stop and during a daytime hike — all situations where a net is either absent or useless. It also covers the awkward hours at the edges of sleep, when you are in the room but not under the net.

The trade-off is that repellent needs reapplying, and it only protects skin you actually cover. Ankles, feet and the back of the neck are the classic misses. Applied properly, an effective active such as PMD, DEET or picaridin gives you hours of protection while you are upright and mobile — the window a net was never designed for. We go into reapplication timing in how long insect repellent lasts.

Nets vs repellent: what works where

Situation Net Repellent Best approach
Air-conditioned hotel room, intact window screens Usually unnecessary Not needed indoors Keep windows shut, use repellent when you go out
Fan-cooled room, gaps under the door or unscreened windows Essential Useful in the evening Both — net over the bed, repellent until you turn in
Open-sided lodge, homestay or jungle camp Essential, ideally treated Essential Both, plus long sleeves after dusk
Tent camping Inner tent mesh usually suffices; pop-up net if sleeping out Essential at dusk Repellent outside, sealed inner tent inside
Daytime in a dengue area No help Primary defence Repellent plus covering clothing
European city balcony in summer Optional for the bedroom window Primary defence Repellent, plus a window screen if mosquitoes get in

The setup most travellers actually need

  1. Check the room first. Screens intact? Door gaps? Air conditioning? A sealed, cool room does much of the work for you — the same logic we apply in keeping mosquitoes out of your bedroom at night.
  2. Carry your own net if you are heading anywhere rural or open-sided. Hotel nets are frequently torn, and a treated net you know the history of is worth the packing space.
  3. Apply repellent from late afternoon in malaria areas, and through the day in dengue areas. Cover ankles, feet and the neck.
  4. Add clothing as a layer. Long sleeves and trousers after sunset reduce the skin you have to treat at all.
  5. Do not substitute gadgets. Ultrasonic apps and wristbands are not a replacement for either a net or a repellent.

How incognito® helps

A net handles the eight hours you are asleep. The other sixteen are ours. Our DEET-free insect repellent spray uses PMD (Citrepel®), a plant-derived active in the same class the CDC and EPA list alongside DEET, and is recommended against both mosquitoes and ticks. It is clinically proven, vegan and biodegradable — which matters when you are rinsing off beside a river or a reef rather than a drain.

If you are packing for a trip where the net goes in the bag, the Elite Traveller Bundle covers the rest of the routine — the spray plus the supporting steps for long days outdoors and evenings that run late.

FAQs

Do I need a mosquito net if I use repellent?
In an open-sided or unscreened room, yes. Repellent wears off overnight and you cannot reapply it while asleep, which is exactly when malaria mosquitoes feed.

Does a mosquito net protect against dengue?
Only if you are sleeping under it during the day. Aedes mosquitoes bite in daylight, so daytime protection has to come from repellent and clothing.

What mesh size should a mosquito net have?
Around 156 holes per square inch is the usual standard — fine enough to keep mosquitoes out while still allowing airflow.

Do I need an insecticide-treated net or is an untreated one enough?
An intact untreated net is an effective barrier. Treated nets add protection where the mesh touches you or has small holes, and are what WHO recommends in malaria-endemic areas.

Can mosquitoes bite through a mosquito net?
Yes, if the mesh is resting against your skin. Hang the net so it stays clear of your body and tuck it under the mattress.

Is a mosquito net necessary in an air-conditioned hotel room?
Usually not, provided the windows are screened and kept shut. Check for door gaps and torn screens before deciding to skip it.

Sources

This article is general information and does not replace medical advice. If you are travelling to a malaria-endemic area, seek travel health advice about antimalarial medication before you go, and see a doctor promptly if you develop a fever after travel. Always read and follow the product label.