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HVAC & Indoor Air

Furnace and AC filters by size and MERV rating, thermostats, and air quality gear.

Use the filters to narrow by brand, role, and key specs. Every product links out to Amazon — always confirm size, fit, and compatibility on the product page before buying.

HVAC Air FiltersThermostatsAir PurifiersHumidifiersDehumidifiersVent Covers & RegistersCoil & Condenser CleanersExhaust & Ventilation FansDuct Sealing
19 products
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Nu-Calgon Evap Pow'r Coil Cleaner Spray
Consumable
Nu-Calgon

Nu-Calgon Evap Pow'r Coil Cleaner Spray

Best for: Flushing a mini-split evaporator coil

Self-rinsing coil cleaner

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Deflecto 4-Inch Louvered Dryer Vent Cap
Core item
Deflecto

Deflecto 4-Inch Louvered Dryer Vent Cap

Best for: Replacing a broken exterior dryer vent

4 in • louvered flap

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iLiving Shutter Exhaust Fan with Thermostat
Core item
iLiving

iLiving Shutter Exhaust Fan with Thermostat

Best for: Venting hot air from a greenhouse automatically

Thermostat-controlled shutter fan

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30-Foot Flexible Dryer Vent Cleaning Brush Kit
Core item
Sealegend

30-Foot Flexible Dryer Vent Cleaning Brush Kit

Best for: Clearing packed lint

30 ft • drill-powered

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FilterScan Wi-Fi Monitor
Core item
FilterScan

FilterScan Wi-Fi Monitor

Best for: Filter-change alerts to your phone

Wi-Fi • app

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Brush-On HVAC Duct Mastic Sealant
Core item
RectorSeal

Brush-On HVAC Duct Mastic Sealant

Best for: Sealing leaky duct seams

Water-based • brush-on

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Amazon Basics 20x20x1 Air Filter 6-Pack, MERV 11 AC Furnace Filters, Dust, Pet, Allergen Control , Electrostatic (Actual Size: 19.75 x 19.75 x .75)
Core item
Amazon

Amazon Basics 20x20x1 Air Filter 6-Pack, MERV 11 AC Furnace Filters, Dust, Pet, Allergen Control , Electrostatic (Actual Size: 19.75 x 19.75 x .75)

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Filterbuy 20x20x1 Air Filter MERV 8 Dust & Allergy Defense (6-Pack)
Core item
Filter buy

Filterbuy 20x20x1 Air Filter MERV 8 Dust & Allergy Defense (6-Pack)

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Simply 12x24x1 Air Filter, MERV 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 11.75"x23.75"x0.75") DUST, Pet, & Allergy Control
Core item
Simply

Simply 12x24x1 Air Filter, MERV 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 11.75"x23.75"x0.75") DUST, Pet, & Allergy Control

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Simply 10x10x1 Air Filter, Merv 8, MPR 600, 6 Pack, Furnace Air Filter for HVAC (Actual Size: 9.75"x9.75"x0.75") DUST, Pet, & Allergy Control
Core item
Simply

Simply 10x10x1 Air Filter, Merv 8, MPR 600, 6 Pack, Furnace Air Filter for HVAC (Actual Size: 9.75"x9.75"x0.75") DUST, Pet, & Allergy Control

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Filtrete 24x24x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 6 HVAC Filters (Actual Size 23.68 x 23.68 x 0.81 in)
Core item
Filtrete

Filtrete 24x24x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 6 HVAC Filters (Actual Size 23.68 x 23.68 x 0.81 in)

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Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 4 HVAC Filters (Actual Size 19.68 x 24.68 x 0.81 in)
Core item
Filtrete

Filtrete 20x25x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 4 HVAC Filters (Actual Size 19.68 x 24.68 x 0.81 in)

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Romeda Aluminum Foil Tape, 2 inch x 65 Feet Foil Tape (3.9 mil), Silver Insulation Adhesive Metal Tape, High Temperature Heavy Duty HVAC Tapes for Ductwork, Dryer Vent, HVAC
Core item
Romeda

Romeda Aluminum Foil Tape, 2 inch x 65 Feet Foil Tape (3.9 mil), Silver Insulation Adhesive Metal Tape, High Temperature Heavy Duty HVAC Tapes for Ductwork, Dryer Vent, HVAC

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Frost King ACF19 Foam Coil Cleaner, 1.18 Pound (Pack of 1), 19 Ounce
Core item
Frost King

Frost King ACF19 Foam Coil Cleaner, 1.18 Pound (Pack of 1), 19 Ounce

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Mini-Split Waterproof Wash Bag
Accessory
Lelemon

Mini-Split Waterproof Wash Bag

Best for: Catching runoff when cleaning a wall unit

Fits most wall-mount heads

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Semi-Rigid Aluminum Dryer Duct Hose
Core item
Deflecto

Semi-Rigid Aluminum Dryer Duct Hose

Best for: Running safe, lint-resistant dryer duct

Semi-rigid aluminum • crush-resistant

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Premium MERV 11/13 HVAC Air Filters
Consumable
Filterbuy

Premium MERV 11/13 HVAC Air Filters

Best for: High-efficiency filtration

MERV 11-13 • pleated

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Fiberglass Mesh Duct Tape
Consumable
Nashua

Fiberglass Mesh Duct Tape

Best for: Bridging wide seams

Fiberglass mesh

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Heavy-Duty 3-Inch Chip Brushes
Tool
Bates

Heavy-Duty 3-Inch Chip Brushes

Best for: Applying the mastic

3 in • pack

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Related Project Collections
Change an HVAC Filter