Skip to content
LearnMetrics
  • Home
  • General HVAC
    • ACH Calculator
    • EER To SEER Converter
    • SEER to EER Converter
    • EER To COP And COP To EER Converter
    • Coefficient Of Performance (COP)
    • CADR Rating
    • AFUE Rating For Furnaces
    • Understanding EER Rating
    • EER Chart For AC Units
    • SEER Rating
      • 16 SEER vs 14 SEER
    • HSPF Rating
    • MERV Rating
    • Watts To Amps Converter
    • Convert kW To Amps
    • BTU To kW Converter
    • BTU to Ton
    • Convert kVA To Amps
    • Wire Gauge Chart
  • Heating
    • Best Tankless Water Heaters
    • Best Tankless Gas Water Heaters
    • Best Electric Tankless Water Heaters
    • Best Garage Heaters
    • Best Space Heaters For Large Rooms
    • Best Pellet Stoves
    • Best Electric Fireplaces
    • Best Baseboard Heaters
    • Best Ventless Propane Heaters
    • Electric Furnace
    • Oil Furnace
    • Gas Furnace
  • Air Conditioning
    • Best Ductless Mini Split AC Units
      • Mr COOL DIY Mini Split Review
      • Best Dual Zone Mini Split Systems
      • Best 3 Zone Mini Split Systems
      • Best 4 Zone Mini Split Systems
      • Best 5 Zone Mini Split Systems
    • Best Mini Split Heat Pumps
    • Smallest AC Units
    • Types Of Air Conditioners
      • Best Through-The-Wall Air Conditioners
      • Best 5,000 BTU Air Conditioners
      • Best 8,000 BTU Air Conditioners
      • Best 10,000 BTU Air Conditioners
      • Best 12,000 BTU Air Conditioners
    • Best Portable Air Conditioners
      • Best Dual-Hose Portable AC Units
      • Cheapest Portable Air Conditioners
      • Zero Breeze Mark 2 Review
      • Battery-Powered Air Conditioner
    • Best Window AC Units
      • Best Casement/Vertical AC Units
      • Best Saddle Air Conditioners
    • BTU Calculator
    • AC Repair
      • AC Not Working
      • How To Recharge A Window AC Unit
      • R410A PT Chart
      • Thermostat Wiring
    • Best Evaporative Coolers
  • Air Quality
    • Best Air Purifiers
      • Alen BreatheSmart Air Purifier Reviews
      • Blueair Air Purifier Reviews
      • Coway Air Purifiers Reviews
      • Dyson Air Purifiers Reviews
      • Hathaspace Smart True HEPA Air Purifier Reviews
      • Honeywell Air Purifier Reviews
      • Levoit Air Purifiers Reviews
      • Molekule Review
      • Okaysou Air Purifier Reviews
      • Winix Air Purifier Reviews
    • Air Purifier Reviews
    • Best Air Curtains
    • Best Air Purifiers For Allergies
    • Best UV Air Purifiers For Mold
    • Best Air Purifiers For Smoke
    • Best Air Scrubbers
  • Humidity
    • Best Commercial Dehumidifiers
    • Best Dehumidifiers
      • 4+6 Best Whole-House Dehumidifiers (Ducted, Portable)
      • 4 Quietest Dehumidifiers: Very Silent (52.1 dB Or Lower)
    • Best Small Dehumidifiers
    • Big Humidifiers For Large Rooms
    • Best Humidifiers For Bedroom

Air Purifiers

Airdog X5 Air Purifier Review: Washable Filters! (+Specs)

by
airdog air purifier rating

 Silicon Valley guys are always trying to improve stuff by solving problems. To properly review the Airdog X5 air purifier, it’s useful to understand how this ‘Most Innovative Air Purifier in 2020’ was invented. The problem Califonia’s Airdog X5 team wanted to improve upon was this: People love their air purifiers. But they have to … Read more

Categories Air Purifiers, Air Quality 2 Comments

3 Okaysou Air Purifier Reviews: Are They Any Good?

by

Okaysou are pretty much the best bang-for-your-buck air purifiers. This cannot be stressed enough: The one thing that constantly came up in writing this Okaysou air purifier review is, “I can’t believe how great filtration system AirMax8L has. It’s only $120. You shouldn’t be able to get Medical Grade HEPA filters for that, much less … Read more

Categories Air Purifiers, Air Quality Leave a comment

12 Best Dyson Air Purifiers Compared + Reviewed (2025)

by
dyson air purifiers compared and reviewed

Dyson air purifiers are head-turners. With Dyson, you don’t really have to ask, “Are Dyson air purifiers any good?”. Dyson is known to create top-notch air purifiers, has an established reputation of almost 30 years now, and everybody loves their devices. Their prices; not so much. All models – from Dyson DP04 to most premium … Read more

Categories Air Purifiers, Air Quality 2 Comments

Hathaspace Air Purifier Review: Comparison Of 2 Best Models & Rating

by
review of hathaspace HSP001 And HSP002 true hepa air purifiers based on specifications

This review goes from “Is Hathaspace air purifier any good?” to “Seriously, it’s less than $200, where can I get one (or three)?” In all seriousness, Hathaspace has come a long way. Here’s the before-and-after situation: BEFORE: Hathaspace started out selling aroma diffusers. AFTER (Now): Hathaspace has produced an air purifier – Smart True HEPA … Read more

Categories Air Purifiers 4 Comments

5 Best Air Scrubbers For Any Kind Of Project (+Specs)

by
5 500 HEPA filter air scrubbers reviewed

“There is dust all over the place. What was the contractor thinking? Why didn’t they use an air scrubber to suck the dust away?” If you work in construction, renovation, and demolition, you know the struggle. Contractor work and dust go hand in hand. Customers will either complain about it or not be pleased with … Read more

Categories Air Purifiers, Air Quality 1 Comment

5 Best Air Purifiers For Cigarette Smoke In 2025 (+ Smell Removal)

by

Smoke (especially cigarette smoke) is impossible to get rid of. Not true at all. Cigarette smoke, wildfire smoke, even cigar, and weed smoke can be effectively removed. The device that helps you do that is an air purifier for smoke. Preferably one specialized in removing high concentrations of smoke (HEPA + activated carbon filters). The … Read more

Categories Air Purifiers 8 Comments

4 Molekule Air Purifiers Compared: Which One Is The Best? (Comparison Table)

by
comparison of air mini, air mini plus, molekule air and air pro with reviews and ratings

If NASA engineers would make an air purifier, they would make the Molekule Air. In fact, Molekule Air utilizes a NASA-developed award-winning PECO filtration technology. That’s why it is commonly referred to as ‘The Most Revolutionary Air Purifier’. Here’s one Molekule Air review that quickly sums up the Molekule experience: “I love the Molekule. I … Read more

Categories Air Purifiers Leave a comment

MERV Rating Chart: Understanding 1-20 MERV Rating (For Filters)

by

Before we look at the MERV rating chart (1-20 rating for 0.3 – 10 micron particles), let’s answer this question: Do you know why HEPA filters are called ‘HEPA’? It’s actually based on the MERV rating. MERV stands for Minimum Efficiency Reporting Value. The rating was devised by the American Society of Heating, Refrigerating and … Read more

Categories Air Purifiers 27 Comments

How Many Air Purifiers Do I Need? One For Every Room?

by
calculated number of air purifiers needed for 2,000 sq ft home

Air purifiers can improve the air quality of the whole house. But what if you have an enormous 10,000 sq ft mansion; will a single air purifier be enough? Of course not. There is some confusion when it comes to air purifiers. In general, these are two kinds of homeowners: The ones with small homes … Read more

Categories Air Purifiers Leave a comment

5 Simple Yet Effective Ways How To Improve Indoor Air Quality Today

by
how to increase indoor air quality

The quality of the air we breathe matters. Getting the fresh air from time to time is helpful. However, we spend more than 80% of our time indoors. Our lungs are thus intricately connected to the indoor air quality. According to EPA’s study ‘Report to Congress on indoor air quality’, “Americans, on average, spend approximately … Read more

Categories Air Purifiers Leave a comment
Older posts
Newer posts
← Previous Page1 … Page3 Page4 Page5 Next →

Relevant HVAC Certificates:

energy efficiency guide

HVAC metrics:

SEER = (1 × EER100% + 42 × EER75% + 45 × EER50% + 12 × EER25%)/100

EER = BTUcooling/W

HSPF = BTUheating/W

COP = Q (useful heat)/W (input work)

ACH = CFM x 60/Area x Heightceiling

Total Heat (BTU/hr.) = 4.5 x CFM x Δh (std. air)

Sensible Heat (BTU/hr) = 1.1 x CFM x Δt (std. air)

Latent Heat (BTU/hr) = 0.69 x CFM x Δgr. (std. air)

1 HP = 746 Watts

1 kW = 3413 BTU

 

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. As an Amazon Associate we earn from qualifying purchases.

  • Terms Of Use
  • Privacy Policy
  • Affiliate Disclaimer
  • About Us
  • Contact
  • Sitemap
© 2026 LearnMetrics • Built with GeneratePress