Best bug zappers for a garage

Why a garage is the best room in the house for a zapper

Most of the objections to bug zappers are about context rather than the device. In a garage, almost all of them disappear.

Nobody minds the snap. The noise that makes a zapper unwelcome on a patio is irrelevant in a building with a chest freezer humming in it.

The debris does not matter much. A grid shatters insects, and the fragments fall. On a concrete floor that is a sweep; over a dining table it is a reason not to own one.

The insects coming in are the ones zappers are good at. Open the roller door on a summer evening with the light on and what comes in is moths, craneflies, midges, beetles and nuisance flies — exactly the light-seeking species a UV grid catches well. Mosquitoes, which zappers are poor at, are a small part of the problem in a garage.

It can run unattended. A garage zapper does its work while you are not there, which is the use case where "it kills hundreds of insects a night" is actually a benefit rather than a statistic.

The one thing a garage zapper will not do is stop you being bitten in the yard. That is a different job and a different product — see best yard mosquito repellents and the honest comparison in do bug zappers work.

Grid or glue board?

This is the real decision for a garage, and it depends on what else is in the building.

A grid electrocutes the insect. It is the more effective of the two at volume, it needs no consumable except the UV tube, and it makes a noise and a mess. Right for a detached garage, a workshop, a bay with a car and a lawnmower in it.

A glue-board light trap uses the same UV lamp but the insects land on a replaceable sticky card instead of a grid. No snap, no fragments, and everything caught is retained on the card rather than scattered. It costs more to run because the boards are a consumable, and it is the correct choice in three cases:

1. An attached garage, where the snapping carries into the house at 2am.
2. A garage that stores food, pet food, animal feed or anything you cook with — debris from a grid is a contamination route, and this is why commercial kitchens use glue-board lights and not grids.
3. A garage used as a workshop or a home gym, where you are in there in the evening and would rather not listen to it.

For an attached garage that doubles as a laundry or pantry, the glue board is not a nicety. It is the right engineering.

What to look for

Indoor or damp rating. An unheated garage is humid and dusty. A unit sold for indoor use is fine in an attached garage; for a detached, unheated, drafty one, an outdoor-rated housing survives longer.

A removable tray. You will empty it, and a unit you can take down and tip out beats one you have to brush out in place.

Hanging hardware. Mount it high — six to seven feet — so nothing walks into it and the debris falls somewhere you do not mind.

Replaceable tube. UV output declines long before the lamp dies. An annual tube on a serviceable unit is much cheaper than a new zapper.

Enough lamp for the space. A single-car garage is satisfied by a small unit. A deep two- or three-car space with a workshop at the back wants more lamp area, or two units.

Where to hang it in a garage

Opposite the door, not beside it. Insects come in at the door; you want them traveling across the space to the lamp rather than being drawn to the opening from outside. A zapper right next to an open roller door pulls insects in from the driveway.

High, and away from the car. Six to seven feet, clear of where you walk and ideally not directly over the bonnet or a work surface.

Away from stored food, feed and pet food. Or use the glue-board unit, which has no debris at all.

Not above the chest freezer or the dog's bed. Same reason.

On a timer or a switch you will actually use. Dusk until midnight gets most of the benefit. Running it twenty-four hours a day shortens the tube and kills a great deal of harmless insect life for no gain.

The other half of the garage problem

A zapper deals with flying insects. A garage usually has two other tenants, and neither is affected by a UV lamp.

Flies around the bins. If the bin store is in or next to the garage, a zapper is downstream of the cause. Best fly traps for a garage and how to get rid of house flies deal with the source.

Mice. A garage is the commonest mouse entry point in a house, because the door seal is imperfect and there is usually seed, pet food or bird food stored in there. Mouse traps for the garage and mice in the garage are the pages, and sealing the door threshold is the single highest-value fix.

And if what you want is fewer insects coming through the door in the first place, the unglamorous answer is the light above the door: a warm-white or amber bulb instead of a cool-white one is substantially less attractive to night-flying insects, and it costs the price of a bulb.