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 Katchy Duo Indoor Insect Trap offers a chemical-free way to reduce mosquitoes, fruit flies, and gnats inside your home. Instead of relying on sprays or repellents, it uses a UV light and a removable scented pod to attract bugs. Then, a silent fan draws them onto a glue board where they get trapped. This method is safe since it does not emit harmful chemicals, making it suitable for indoor use around people and pets. The trap is easy to use, with adjustable light and fan settings, including an automatic mode that turns on only in the dark to save energy. Its compact, sleek design fits nicely in kitchens, entryways, or offices without looking messy.

The glue boards need to be replaced every 3-4 weeks to maintain effectiveness, which is straightforward but requires ongoing upkeep. Coverage is best for small indoor areas; it targets fruit flies, gnats, and mosquitoes but does not work on house flies. Since it traps rather than repels mosquitoes, it functions more as a removal device than a preventative barrier.

For those seeking a chemical-free, low-maintenance approach for indoor flying insects, this trap serves as a solid choice. However, if quick knockdown, wider coverage, or targeting a broader range of pests is desired, other options with active repellents may be more suitable.

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.