10 Best Indoor Mosquito Repellents 2025 in the United States

The Thermacell Rechargeable Mosquito Repeller Refills offer a convenient and effective way to keep mosquitoes at bay without the use of DEET, sprays, or flames. The product uses a heat-activated, scent-free repellent that provides a 20-foot protection zone. It's powered by a rechargeable lithium-ion battery, offering up to 5.5 hours of continuous protection per charge, making it ideal for extended use without frequent recharges.

The refills are compatible with Thermacell E-Series and Radius models, enhancing their versatility for existing users of these products. The repellent is independently tested and EPA reviewed, ensuring it is safe and effective against mosquitoes that may carry harmful viruses like West Nile and Zika. Additionally, it is pet and people-friendly, which adds to its appeal for households with children and animals.

One of the standout features is its ease of use—simply replace the cartridge, and there's no need to monitor fuel levels. However, it's important to note that it only works with specific Thermacell models and not with fuel and mat-powered repellers. This could limit its usability for some. For indoor use, the 20-foot coverage area is adequate, although for larger areas, multiple units might be necessary. Given its portability and the absence of harsh odors, it offers a user-friendly solution for indoor mosquito control.

The Flowtron Indoor Bug Zapper is an electric insect killer designed for indoor use, covering up to 2,000 square feet. Instead of chemical repellents, it uses a combination of 120W UV light bulbs and a pheromone lure to attract flying pests like mosquitoes, flies, gnats, and moths. Once attracted, insects are instantly killed by an electrostatically charged grid, which is enclosed to prevent accidental contact.

The dead bugs fall into a removable chamber, making cleanup simple and hygienic without the need for sticky traps or sprays. This zapper is UL certified, ensuring safe operation in places like kitchens, restaurants, and barns. It doesn’t rely on chemicals, so it’s safer for indoor use, but it’s mainly effective against flying insects that are drawn to light.

The unit is fairly large and weighs 17 pounds, so it might not be as portable as smaller devices. It doesn’t provide ongoing repellency like sprays or coils, but it is a practical choice if you want a chemical-free, hands-off way to reduce flying insects over a large indoor space.

Zevo Flying Insect Killer Spray is a versatile bug spray designed for indoor and outdoor use, targeting mosquitoes, gnats, fruit flies, and house flies. Its key strength lies in its natural active ingredients—plant-based rosemary and cornmint oils—which make it safer for use around people and pets compared to harsh chemical sprays. The fast-acting formula kills insects on contact without leaving messy residue, making clean-up easy.

The spray comes as a liquid spray formulation, which allows for precise targeting of flying insects in various areas like kitchens, living rooms, and patios. It is recommended to avoid spraying directly on food preparation or storage surfaces. The 30-ounce bottle size suggests it should last through several treatments in typical home settings.

Zevo is a good option for those looking for a natural, easy-to-use indoor mosquito and flying insect killer, especially if you want to avoid synthetic chemicals and prefer quick results. Users should be mindful of where they apply it and understand that it may not provide long-lasting repellency.