Find a system
Certified equipment grouped the way people shop for it — by the size you need, the efficiency tier you are choosing between, or the technology. Every table ranks on a stated, verifiable metric and shows where each unit is sold. No star ratings, no paid placement.
By capacity
The size question comes first, and it is the one a contractor quotes on.
- 6,000 BTU heat pumps 166 units
- 12,000 BTU heat pumps 1,787 units
- 18,000 BTU heat pumps 1,365 units
- 24,000 BTU heat pumps 1,295 units
- 30,000 BTU heat pumps 687 units
- 36,000 BTU heat pumps 1,021 units
- 42,000 BTU heat pumps 239 units
- 48,000 BTU heat pumps 746 units
- 54,000 BTU heat pumps 409 units
- 60,000 BTU heat pumps 97 units
- 6,000 BTU window air conditioners 17 units
- 8,000 BTU window air conditioners 73 units
- 10,000 BTU window air conditioners 75 units
- 12,000 BTU window air conditioners 80 units
- 14,000 BTU window air conditioners 33 units
- 18,000 BTU window air conditioners 17 units
- 24,000 BTU window air conditioners 22 units
Furnaces by input rating
The number on the unit and the one people search — gas and oil together, each group ranked by AFUE at a fixed size.
- 40,000 BTU furnaces 390 units
- 60,000 BTU furnaces 849 units
- 80,000 BTU furnaces 1,066 units
- 100,000 BTU furnaces 964 units
- 120,000 BTU furnaces 678 units
- 140,000 BTU furnaces 238 units
Water heaters by fuel and type
Fuel sets both the install constraint and the running cost, so it is the decision that comes first — and tanks are kept apart from tankless, because a point-of-use heater is not a substitute for a 50-gallon tank. Ranked by UEF, which compares across fuels.
- Natural gas water heaters (storage tank) 1,011 units
- Electric water heaters (storage tank) 894 units
- Propane water heaters (storage tank) 537 units
- Dual-fuel water heaters (natural gas or propane) 168 units
- Tankless gas water heaters 409 units
- Electric tankless water heaters 330 units
- Heat pump (hybrid) water heaters ranked separately
By efficiency and type
The tier and technology decisions — where the operating-cost gap actually lives.
- 1.5 ton central air conditioners 30 units
- 2 ton central air conditioners 50 units
- 2.5 ton central air conditioners 37 units
- 3 ton central air conditioners 48 units
- 3.5 ton central air conditioners 25 units
- 4 ton central air conditioners 30 units
- 4.5 ton central air conditioners 22 units
- 5 ton central air conditioners 20 units
- Mini-split (ductless) heat pumps 5,381 units
- Ducted heat pumps 2,438 units
- R-454B heat pumps 3,413 units
- R-32 heat pumps 1,722 units
- The quietest window air conditioners 41 units
- Window air conditioners that also heat 30 units
- Window air conditioners that need a 230V circuit 75 units
Air purifiers by room size and running cost
Every AHAM-certified purifier, ranked by smoke CADR for your room size, or by what it costs a year to run.
- Air purifiers up to 200 sq ft 62 units
- Air purifiers rated 200-400 sq ft 130 units
- Air purifiers rated over 400 sq ft 42 units
- The cheapest air purifiers to run 207 units
Every air purifier we have a page for
113 purifiers, by brand. Each page shows the AHAM-certified CADR and the room size it suits.
- Aerus Blue Signature SP3i (4431311001)
- Airhub A068S · A280 · A281 · A282
- Atmosphere Mini 124746IN
- Atmosphere SKY 120539CH
- Blueair 3131000100 · 3234101100 · Blue Pure 311i Max (3332111100) · Pure Blue 211i Max (3613111100) · Blue Signature SP3i (4431311000) · Blue Signature SP3i (4432311000) · Blue Signature SP3i (4442411000) · Blue Signature SP3i (4442411001) · 4612522000 · 6541511000 · 6551511000 · 7470i (7413352000) · 7710i US (7711371000) · Blue Pure 211+ Auto · Blue Pure 311 Auto · Blue Pure 311i+ Max · Blue Pure 411 Max · Blue Pure 411a Max · Blue Pure 411i Max · Blue Signature SP1i · Blue Signature SP1i · Blue Signature SP3i · DustMagnet 5240i · DustMagnet 5410i
- Coway Airmega 200M · Airmega AP-1512HH
- Dreame CVF16A · CVF20B · CVF50A · CVF54A · CVF61A
- Dreo Air Purifier 338 and 338S · Air Purifier 539 and 539S · DR-HAP003S · DR-HAP007AS · DR-HAP009AS · DR-HAP010S · DWAP03S · DWAP09 · DWAP09AS
- Fellowes AeraMax SV
- Field Controls TRIO Plus · TRIO Plus S · TRIO Pro
- Germguardian AC4300WPT · AC4820 · AC5250PT · AC5350 · AirSafe+ XL AC3250
- Honeywell HPA060C · HPA104C · HPA125B · HPA4100B · HPA4200B
- Insigna NS-APLWH2 · NS-APMWH2-C
- Jafanda JF100 · JF180 · JF239 · JF260S · JF280 · JF282 · JF500
- KNKA APH4000
- Levoit Core 300 · Core 400S-P · Core 600S-P · LAP-C171-ACAR · LAP-C201S · LAP-C311S · LAP-C341S-WCAZ · LAP-P501S-WUSR · Vital 100S-P · Vital 200S
- Lichen AIR Lichen Air
- LUX LACH-2 Hera · LACS-1 Aura
- Momcozy AP01
- Philips PureProtect Pro 4200
- Senville SENAP-250G-Z41
- Sharp Airest (AY-XP12CPU) · DW-T30FE-H · DW-T30FL-H · DW-T30FY-H · FP-S40Y-W · FP-S42EU-L
- Whirlpool Whispure WP500 · Whispure WPPRO2000 · Whispure WPT80
- Windmill SAP4V1
- Winix 5300-2 · 5500-2 · 5510 · 5520 · 5530 · AT40 · AT41 · C545 · C610 · C710 · T810
- Wozoyo Pure Air PA1 · Pure Air PA6 · Pure Air PA7 · Pure Air PA12
- Zojirushi PU-SAF35
Buying a DIY mini-split on Amazon
What each Amazon listing says about itself, checked against its AHRI certificate.
- DIY mini-splits by refrigerant (R-454B, R-32, R-410A) 161 listings
- MRCOOL DIY vs Pioneer, 12,000 BTU 115 V 2 units
- MRCOOL DIY vs Senville LETO, 12,000 BTU 8 units
- MRCOOL DIY vs Easy Pro, 12,000 BTU 115 V (both Easy Pro kits) 3 units
- Cooper & Hunter vs MRCOOL DIY, matched by size 11 units
A group is published only when it holds at least 50 certified units — thinner slices stay reachable in the full product list rather than becoming their own page. 29,466 certified units appear across these 48 tables.