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 * 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


ANALYSIS AND SPECIFICATION-BASED COMPARISON OF HVAC SYSTEMS

With a little help, every HVAC system can be boiled down to a number of metrics
such as BTU, EER, maximum dry airflow, and so on. This is true for all HVAC
systems: air conditioners, heaters, dehumidifiers, boilers, you name it.
Everything that is built on the principles of thermodynamics, fluid
mechanics, heat transfer, and other macroscopic concepts can be measured pretty
accurately.

In fact, education concerning the specifications should be in the focus every
time we’re deciding to install a new Heating, Ventilation, and Air Conditioning
device. That’s the only way we can learn what are the capabilities of our
hardware.

At LearnMetrics, we combine different analytical tools to analyze, aggregate,
and compare different specifications – the raw data behind HVAC appliances. We
bring all the messy data into focus and help you prioritize your time and focus
on the best HVAC system currently on the market.

Here is LearnMetrics’s categorization of all the useful resources for HVAC
enthusiasts:

Air Conditioning
Heating
Air Quality
Humidity
General HVAC


ANALYSIS OF THE BEST HVAC DEVICES

Based on the aggregated metrics we can learn from raw data, lists of the best
HVAC devices of any kind can be made just by looking at pure numbers. We also
include some insightful informational articles about specific heating,
ventilation, and air conditioning devices. Here are some examples of the
analysis-based lists and articles, starting with out latest posts:


LATEST POSTS


7 BEST AIR PURIFIER FOR PET HAIR AND DUST (FOR FLUFFY CATS, DOGS)


KBTU TO KWH CALCULATOR: CONVERT KBTU TO KWH (+ CHART)


MMBTU TO KBTU CALCULATOR: CONVERT MMBTU TO KBTU (+ CHART)


KWH TO KBTU CALCULATOR: CONVERT KWH TO KBTU (+ CHART)


THERMS TO KBTU CALCULATOR: CONVERT THERMS TO KBTU (HEATING)


KPA TO N/M2 CALCULATOR: CONVERT KILOPASCALS TO NEWTONS PER M2


TONS TO MBH CALCULATOR: CONVERT TONS (TR) TO MBH


KW TO MBH CALCULATOR: CONVERT KILOWATTS TO MBH (+ CHART)


MBH TO KW CALCULATOR: CONVERT MBH TO KILOWATTS (+ CHART)


BTU/H TO MBH CALCULATOR: CONVERT BTU/H TO MBH (+ CHART)


MBH TO BTU/H CALCULATOR: CONVERT MBH TO BTU/H (+ CHART)


PSI TO BAR CONVERSION CALCULATOR + 0.01-1000 PSI TO BAR CHART


BAR TO PSI CALCULATOR: CONVERT BARS TO PSI (+ PRESSURE CHART)


KG/CM2 TO PSI CALCULATOR: CONVERT KILOGRAMS PER CM2 TO PSI (+CHART)


KPA TO MMHG CALCULATOR: CONVERT KILOPASCALS TO MILLIMETER HG (+CHART)

 


AIR CONDITIONERS


MRCOOL 3RD GEN VS 4TH GEN DIY: SEER, HSPF COMPARISON


AC 20-DEGREE RULE OF THUMB EXPLAINED: REAL OR NONSENSE?


DOES TESLA USE MORE ELECTRICITY THAN HOME AC UNIT? (SURPRISING RESULT)


WHAT HAPPENS IF AIR FILTER IS BACKWARDS? FROM BAD TO AWFUL


AIR CONDITIONER DRY MODE VS DEHUMIDIFIER EXPLAIN: SAME?


DRY MODE IN AC EXPLAINED: WHAT DOES DRY MODE DO? ELECTRICITY USAGE?


PORTABLE AC UNIT LEAKING WATER FROM BOTTOM? 10+ CULPRITS + FIXES


DO PORTABLE AIR CONDITIONERS PULL AIR FROM OUTSIDE? (WILDFIRE SMOKE)


AIR CONDITIONER BTU CALCULATOR (WITH AC BTU FOR ROOM SIZE CHART)


HOW MANY CFM PER SQUARE FOOT IN HVAC? (+ 2,000 SQ FT EXAMPLE)


MINI SPLIT SIZING CALCULATOR: HOW MANY BTU MINI SPLIT DO I NEED?


LOW SUPERHEAT NORMAL SUBCOOLING: 3 CAUSES + HOW TO FIX AC?


HIGH SUPERHEAT NORMAL SUBCOOLING: HIGH CFMS OR EXCESSIVE HEAT LOAD


LOW SUPERHEAT HIGH SUBCOOLING: IT’S OVERCHARGED AC, HERE’S WHY


LOW SUPERHEAT LOW SUBCOOLING: ONLY 1 CAUSE + HOW TO FIX IT


WHAT CAUSES HIGH OR LOW SUBCOOLING? 4 CULPRITS + FIXES


6 LOW SUPERHEAT CAUSES: LOW CFMS, OVERCHARGED OR OVERSIZED AC


6 HIGH SUPERHEAT CAUSES + HOW TO FIX HIGH SUPERHEAT


TARGET SUBCOOLING CHART? THERE IS NO CHART, HERE’S WHY


TARGET SUPERHEAT CHART + CALCULATOR, FORMULA, R22, 410A EXAMPLES


DEHUMIDIFIERS


AIR CONDITIONER DRY MODE VS DEHUMIDIFIER EXPLAIN: SAME?


BEST TIME OF DAY TO USE DEHUMIDIFIER EFFECTIVELY? (10 PM TO 8 AM)


WHEN SHOULD I TURN OFF A DEHUMIDIFIER? WINTER VS SUMMER, 50% RH RULE


SHOULD A DEHUMIDIFIER RUN CONSTANTLY 24/7? IN BASEMENT ALL THE TIME?


HOW MUCH WATER SHOULD A DEHUMIDIFIER COLLECT IN A DAY? (20-170 PINT CHART)


HOW LONG DOES A DEHUMIDIFIER TAKE TO WORK? 5-10 MINUTES?


WHAT TEMPERATURE TO SET AIR CONDITIONER IN SUMMER: 72, 75, 78°F?


4 BEST DEHUMIDIFIER AND AIR PURIFIER COMBOS (ALL-IN-ONE UNITS)


SHOULD I RUN MY DEHUMIDIFIER ON LOW, MEDIUM, OR HIGH? (SIMPLE)


DEHUMIDIFIER FREEZING UP (EVEN ICING UP): 4 COMMON CAUSES & FIXES


HEATERS (INCLUDING STOVES AND TANKLESS WATER HEATERS)


HOW MUCH IT COSTS TO RUN A 750-WATT HEATER FOR 1, 8, 24 HOURS?


8 BEST INFRARED HEATERS FOR INDOORS, PATIOS, GARAGES (WITH ECO THERMOSTATS)


HOW MUCH PROPANE DO HEATERS USE? (PROPANE BTU CALCULATOR)


6 SAFEST SPACE HEATERS IN 2024 (7-POINT SAFETY CHECKLIST)


4 BEST SMALLEST HEATERS FOR HEATING SMALL ROOMS (UP TO 171 SQ FT)


HOW MUCH DOES IT COST TO RUN A 1500 WATT HEATER FOR 1, 8, 24 HOURS?


4 BEST OIL-FILLED RADIATOR HEATERS IN 2024 (WITH ECO THERMOSTATS)


4 BEST LOW-WATTAGE SPACE HEATERS (BELOW 500 WATTS, 4.5 AMPS)


WHAT SIZE SPACE HEATER DO I NEED? WATTAGE TO SQ FT CHART + CALCULATOR


ELECTRIC HEATER BTU CALC: HOW MANY BTU IS 1500 WATT HEATER?


PAINFUL TRUTH ABOUT 1P PER HOUR ELECTRIC HEATERS: IT’S ACTUALLY 26P?


HOW MANY AMPS DOES A SPACE HEATER DRAW? (1500 WATT EXAMPLE)


4+5 BEST ELECTRIC GARAGE HEATERS 120V AND 240V (2024)


7 BEST CORDLESS BATTERY-OPERATED HEATERS: DO THEY EVEN EXIST?


8 BEST SMALL HEATERS FOR SMALL ROOMS (BELOW 200 SQ FT)


4 QUIETEST SPACE HEATERS (BEST HEATERS FOR BEDROOMS); BELOW 49.7 DB


4 BEST WALL MOUNTED ELECTRIC HEATERS (UNDER $0.30/H)


7 BEST ELECTRIC FIREPLACES IN 2024 (+10 SPECS TO CHECK BEFORE BUYING)


HOW MANY BASEBOARD HEATERS ON A 20-AMP CIRCUIT? (2400-4800 W)


6 BEST BASEBOARD HEATERS IN 2024 (ELECTRIC, HYDRONIC, HOT-WATER)


AIR PURIFIERS TO IMPROVE INDOOR AIR QUALITY

Here are some free resources concerning air purifiers; including specs analysis,
types of filter, ACH calculation, CADR rating, and so on.


7 BEST AIR PURIFIER FOR PET HAIR AND DUST (FOR FLUFFY CATS, DOGS)


AIR PURIFIERS WITH UV LIGHTS: WHY UV-C FILTER ALONE IS NOT ENOUGH?


HEPA FILTER H13 VS H14: WHAT IS THE KEY DIFFERENCE HERE?


4 ABSOLUTE QUIETEST AIR PURIFIERS ON THE MARKET (BELOW 52.1 DB)


AIR PURIFIER ROOM SIZE CALCULATOR: WHAT SIZE AIR PURIFIER DO YOU NEED?


4 SMALLEST AIR PURIFIERS FOR SMALL ROOMS (BELOW 200 SQ FT)


9 BEST AIR PURIFIERS TO REMOVE DUST IN 2024 (DUSTY HOUSES)


4 BEST DEHUMIDIFIER AND AIR PURIFIER COMBOS (ALL-IN-ONE UNITS)


5 BEST AIR PURIFIERS FOR ALLERGIES IN 2024 (+ H13 MEDICAL-GRADE HEPA FILTERS)


4 BEST WALL-MOUNTED AIR PURIFIERS: WHY WALL IS BEST PLACEMENT?


ACTIVATED CARBON AIR FILTER: HOW DOES A CARBON FILTER WORK? (ADSORPTION)


HOW MUCH ELECTRICITY DOES AN AIR PURIFIER USE? DO THEY USE A LOT?


HEPA FILTER TYPES + MECHANISMS OF HEPA FILTER FILTRATION


OZONE GENERATORS: HOW DOES AN OZONE MACHINE WORK? (+SAFETY CONCERNS)


CFM CALCULATOR: HOW TO CALCULATE CFM? (CFM CALCULATION + CHARTS)

--------------------------------------------------------------------------------




LEARN ABOUT HVAC METRICS AND SPECIFICATIONS

We find it paramount for everybody who owns an HVAC device (well, we all do) to
learn a thing or two about HVAC metrics. That’s why we feature key explanation
articles about what, for example, SEER and BTU mean when comparing the best
ductless mini split AC units.

At LearnMetrics we understand that people who are looking to learn and get an
insight into specifications are from the US and also from other parts of the
world. The difference in units here is important to grasp. That’s why we feature
several converters from US imperial units to metrics systems.

For example, when choosing the best tankless water heaters, you have to
determine the size. Size can be expressed in maximal hot water flow (GPM) for
gas heaters or kW for electric heaters. In order to compare them, we have to use
the same units.

Additionally, people looking to compare different air conditioners,
dehumidifiers, or heaters often need a common unit-based system to make their
job easier.

For example, EER, SEER, and COP are all metrics that denominate
energy-efficiency HVAC devices such as portable air conditioners. They are
interchangeable; that’s why we offer a calculator that can convert EER to SEER
and COP and so on. Here are some examples:


HOW MANY KW AIR CONDITIONER DO I NEED? AC KW CALCULATOR + CHART


SEER2 SAVINGS CALCULATOR: WHICH SEER2 UNIT IS A SMARTER CHOICE?


AC SEER VS TONNAGE: WHY ARE WE STILL MIXING THEM TOGETHER? (EXPLAINED)


HOW MUCH DOES IT COST TO RUN A MINI SPLIT PER MONTH? (CALCULATOR)


1.5 TON AC WATTS AND POWER CONSUMPTION (CALCULATOR + CHART)


TON TO KW: TONS OF REFRIGERATION TO KW CALCULATOR + CHART (TR TO KW)


KW TO TONS OF REFRIGERATION CALCULATOR + CHART (KILOWATT TO TON)


HOW LONG SHOULD IT TAKE TO COOL A HOUSE? (CALCULATOR + CHART)


ESEER EXPLAINED: EUROPEAN SEASONAL ENERGY EFFICIENCY RATIO


IEER EXPLAINED: INTEGRATED ENERGY EFFICIENCY RATIO (VS EER, SEER)


HVAC EXPERTS IN BIGGER CITIES

We have received a number of requests to recommend local HVAC experts who can
repair, install, or service different HVAC devices (from air conditioners to
tankless heaters). That’s why we started a program where we try to recommend the
most reliably HVAC companies and technicians in bigger cities.

For starters, we created a list of the best HVAC experts in Chicago (here). We
hope to grow this program to include all the major cities in the US. That’s how
we can effectively merge digital advice about HVAC devices and calculations with
hands-on HVAC technicians who can adequately and promptly respond to your
heating and cooling needs in the field.


RELEVANT HVAC CERTIFICATES:




FOLLOW US ON FACEBOOK:


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

 


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