Model comparison
Blueair ComfortPure T10i vs T20i: room, heat and filter fit
The Blueair ComfortPure T10i and T20i share three distinct functions—air purification, fan-driven cooling and electric heat—but their practical fit is not interchangeable. The T10i is the smaller-capacity room unit; the T20i is substantially larger and heavier. The decision turns on the room’s repeated-cleaning rating, the floor space available for a heater, and whether you need the extra air delivery enough to accept the larger appliance.
Compare the rate-labeled room figures first
Blueair lists 175 square feet at 4.8 ACH for T10i and 352 square feet at 4.8 ACH for T20i. That puts T10i above the 140-square-foot compact tier but below the finder’s 219-square-foot small tier. T20i meets the 219-square-foot small threshold but does not reach the 358-square-foot medium threshold. The pages also give larger “in 30 minutes” and “in one hour” areas; those describe slower cycles and are not equivalent to the 4.8-ACH room benchmark.
The product-page CADRs are pollutant-specific, not a single generic figure: T10i lists pollen/dust/smoke at 132/129/113 CFM; T20i lists 252/238/227 CFM. A strict generic-CADR minimum therefore remains unknown for both models. Likewise, their room-area numbers are not a promise for an open plan, blocked intake or every fan setting.
The capacity increase costs real floor space
T10i measures 19.8 by 10.3 by 10.3 inches, weighs 13.8 pounds and lists 21 watts. T20i is 27.4 by 13.6 by 13.6 inches, weighs 26.9 pounds and lists 36 watts. Blueair’s manual shows one rear handle on T10i and two pull-out side handles on T20i; it does not document wheels. Both need open air clearance, and the heater makes a safe spot especially important.
During heating, the manual requires floor placement, three feet between the heater and combustible items, direct connection to a grounded wall outlet without an extension cord or power strip, and a cool-down before moving or service. Heat shuts off after 24 hours. If the only viable location is a narrow bedside gap, shelf or corner beside curtains, the T20i’s room capacity does not rescue the layout. The smaller T10i has similar heating restrictions, even though its body is easier to lift.
Modes are alternatives with different controls
Both models can purify while heating or blowing room-temperature air. Cooling is a fan function, not air conditioning. Blueair’s manual says heat cannot be started in the app; the temperature target is selected at the device. Purification Auto reacts to PM2.5, but Auto in heating mode works toward the set temperature. Night and Eco are unavailable during heat, and the number display changes from PM2.5 to the heat target. A buyer who requires phone-started heat, sensor Auto and Night all at once should not treat the shared mode list as proof that this combination exists.
Both have a five-color AQI indicator, a PM2.5 sensor, a numeric display that changes with mode, manual controls and app connection. First pairing uses Bluetooth and 2.4-GHz Wi-Fi. A PM2.5 indicator is not a gas/TVOC sensor, and cooling air at room temperature should not be mistaken for a temperature-setting function.
Filters are sized to the model, not merely the family name
Each stand-alone offer includes one purifier and one Particle + Carbon filter, but the replacement cartridge is separately named and sized for T10i or T20i. Do not buy the other model’s filter because both units say ComfortPure. The manual distinguishes the washable pre-filter surface from the non-washable central cartridge. Vacuum the pre-filter gently each week, and shut off, unplug and cool the heater before filter or sensor service. The red indicator is usage/pollution-based. Exact model filter pages say up to nine months while purifier-page FAQs say up to a year and the official 3-in-1 support guidance recommends six to nine months; use the indicator and local conditions rather than the longest interval as a guarantee.
Choose the model that matches the whole routine
Choose T10i for a room up to its 175-square-foot repeated-cleaning rating when the heater and fan cooling are genuine benefits and you want the smaller body. Choose T20i when the larger 352-square-foot rating is needed and there is room for the heavier unit plus safe heater clearance. If you only need filtration in a similar or larger area, compare a dedicated purifier such as Blueair 311i+ Max; it avoids heater-placement rules but cannot provide the ComfortPure’s warm-air mode. Neither ComfortPure model is the right substitute for an air conditioner when lowering room temperature is essential.
Sources: Blueair’s exact U.S. T10i and T20i product pages, the shared 24-page model manual, and Blueair’s 3-in-1 support and FAQ page. All comparisons use the exact model-specific figures and operating instructions, not independent testing.