HEPA Air Purifiers for Allergies, Pets and Cleaner Home Air

Yes. A True HEPA H13 air purifier captures 99.97% of airborne allergens down to 0.3 microns, including pollen, dust mite debris and pet dander the main triggers for most allergy sufferers. For best results, run it continuously in the room you spend most time in, such as the bedroom, and keep windows closed during high-pollen periods. It treats airborne particles, so it works alongside (not instead of) regular cleaning.

It can make a real difference indoors. Pollen grains are large enough for a True HEPA filter to trap easily, so a purifier running in your bedroom or living room reduces the pollen load in the air you breathe at home. Many sufferers find overnight running gives them a clearer start to the day. Combine it with an activated carbon stage if outdoor smells or traffic fumes also bother you.

True HEPA purifiers can help by reducing airborne particles like dust, pollen, pet dander and PM2.5 that can trigger symptoms. Choose an ozone-free model all of ours are as ozone can irritate sensitive airways. A purifier is a supportive measure for a cleaner home environment and is not a medical device, so always follow advice from your GP or asthma nurse for managing the condition.

Yes. True HEPA filtration captures fine pet dander the microscopic skin flakes that cause most pet allergies while the pre-filter traps larger hair and fluff before it clogs the main filter. Place the unit near where your pet sleeps or lounges for the biggest impact. If you have pets, expect to clean the pre-filter more often and replace the HEPA filter a little sooner.

For most home air purifiers, a True HEPA filter lasts around 6 to 12 months depending on use and how dusty or pet-heavy your home is. Many units have an indicator light that tells you when it's due. Running on a higher setting or in a smoky or very dusty environment shortens filter life, so check the price and availability of replacement filters before buying.

Very little. Purifiers are rated in watts, not BTU, and a typical model such as the Levoit Core 300S uses about 33W on its highest setting roughly 0.9p per hour at the current ~26p/kWh, and only a fraction of that on sleep mode. Running one overnight in a bedroom usually costs just pennies, making continuous use affordable for most households.

Match the purifier's stated m² coverage and CADR rating to your room size. As a guide, pick a unit rated for slightly more floor area than you actually have so it can clean the air several times an hour on a lower, quieter setting rather than running at full power. A compact unit suits a bedroom or nursery, while open-plan living spaces need a higher-CADR model.

CADR stands for Clean Air Delivery Rate it measures how quickly a purifier delivers filtered air, usually for pollen, dust and smoke. A higher CADR means it cleans a given room faster, or can handle a larger room. Use CADR alongside the stated m² coverage to size the unit to your space: it's the most reliable real-world indicator of cleaning performance.