my 2 year old boy had a rhinitism.. its an early symptom of athmatism... i bought sharp purifier, medklinn and medklinn for cars.. in total its over 1k. but its really worth every penny.. the rhinitism was very less compared to previous.. medklinn doesnt have hepa filter. so it can be turned on 24/7. sharp have hepa filter, so i only turn it on while i was at home. next year planning to upgrade to lombok from coway..

ive tested the medklinn without turning on the sharp for 1 month.. the usage increase less than rm4

HEPA filter had a lifespan. the more u use it, the more dirt on the HEPA..

sharp does not consume electricity that much.. just make sure u dont turn the fan to the max 24/7.. the slowest or medium should be sufficient for a room.. summore u dont want to sleep with the fan on maximum.. the sound quite annoying..

if u feel that the house is very dusty, u go for a HEPA one.. u could see the differences within a few days if it was a closed area..