Thermacell
Thermacell EX90 Rechargeable Mosquito Repeller
Spatial Device · EPA-registered spatial repellent device
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Pros
- The strongest zone you can buy without spraying yourself: Thermacell's flagship holds a 20 ft still-air bubble that cuts bites 70 to 97% while you sit in it.
- Nothing on your skin and no smoke; it just runs off a rechargeable battery and warms a metofluthrin cartridge.
- One of the few area devices with the active strength (5.5% metofluthrin) printed right on it.
Cons
- It protects the space, not you: step out of the bubble, or let a breeze through, and the coverage thins fast.
- The vapor is highly toxic to fish, so keep it well away from ponds, aquariums, and water features.
The full review
Rechargeable area repeller that warms a metofluthrin cartridge to release a mosquito-repelling vapor over roughly a 20-foot zone, protecting the space around you rather than your skin. Runs about 9 hours per charge on a 12-hour refill, with no open flame or fuel canister. Like all vapor emanators it works best in still air, and the effective zone shrinks in wind or open conditions.
Scorecard
Expand any pillar to see exactly why it scored what it did.
Effectiveness45%91This is an area device, not applied to skin: published field trials report roughly 70–97% fewer mosquito landings or bites, over about a 20 ft zone. Scored 60% on that reduction and 40% on how much space it protects, so a larger zone counts for real. Reduction figures come from controlled or semi-field trials, not backyard conditions. Real-world protection drops sharply in wind and open air, so this is scored with lower confidence.
This is an area device, not applied to skin: published field trials report roughly 70–97% fewer mosquito landings or bites, over about a 20 ft zone. Scored 60% on that reduction and 40% on how much space it protects, so a larger zone counts for real. Reduction figures come from controlled or semi-field trials, not backyard conditions. Real-world protection drops sharply in wind and open air, so this is scored with lower confidence.
Evidence & honest claims25%82Metofluthrin is backed by definitive published evidence, weighted by how close its concentration is to the studied effective dose (base 72). Of 4 marketing claims audited: 2 strong, 2 moderate, 0 weak, 0 unsupported (+10).
Metofluthrin is backed by definitive published evidence, weighted by how close its concentration is to the studied effective dose (base 72). Of 4 marketing claims audited: 2 strong, 2 moderate, 0 weak, 0 unsupported (+10).
Safety15%60This is an area device, not applied to skin, so dermal risk does not apply. Scored on moderate inhalation risk from the vapor (−18); high toxicity to fish and aquatic life (−22). Use it outdoors in the open air only. Keep it well away from ponds, aquariums, and water features.
This is an area device, not applied to skin, so dermal risk does not apply. Scored on moderate inhalation risk from the vapor (−18); high toxicity to fish and aquatic life (−22). Use it outdoors in the open air only. Keep it well away from ponds, aquariums, and water features.
Transparency15%85This product names its active ingredient (+30); discloses the strength of every active (+35); publishes a concrete coverage figure (+20).
This product names its active ingredient (+30); discloses the strength of every active (+35); publishes a concrete coverage figure (+20).
Every pillar is scored from published rules. Read how we score.
Coverage & effectiveness
This is an area device: it protects a zone around it rather than your skin. Effectiveness is the published reduction in mosquito landings or bites. Real-world protection is best in still air and drops in wind or open space.
Mosquitoes
EstimatedModerate- Protected zone
- ~20 ft zone
- Fewer bites
- 70–97%
Controlled still-air trials of metofluthrin emanators show roughly 91 to 97 percent fewer mosquito landings. Real backyard performance runs lower and drops sharply in wind or open air, so treat the 20-foot zone as a still-air best case rather than a guarantee.
Ingredient disclosure
This product names its active ingredient (+30); discloses the strength of every active (+35); publishes a concrete coverage figure (+20).
Only active ingredients are disclosed. The full ingredient list (inerts/carriers) is not published, so this may not be the complete formula.
- MetofluthrinActive
Active repellent · 5.5%
Claims audit
What the marketing says, versus what the evidence supports.
“Creates a 20-foot zone of mosquito protection”
EfficacyModerateZone figure reflects favorable, still-air conditions. Wind and open air reduce the effective range.
“Independently tested and EPA reviewed for safety and effectiveness”
SafetyStrongMetofluthrin is EPA-reviewed and classified as practically nontoxic; the device is EPA-registered.
“DEET-free and scent-free”
Deet FreeStrongActive is metofluthrin, not DEET.
“About 9 hours of protection per charge with a 12-hour refill”
DurationModerateBattery and refill runtimes are per manufacturer; realized protection still depends on wind and placement.
Safe around dogs & cats?
Worst case from this product’s active ingredients. Do not apply this or any human repellent to your pet.
Mainly from Metofluthrin.
Not veterinary advice. Full guide to repellents around pets →