Do thermal cameras show insulation gaps?

Yes — missing or compressed insulation shows as a distinct cold or warm patch when there is a temperature difference across the wall.

What resolution thermal camera do I need for home use?

160x120 is enough to find missing insulation and leaks. Higher resolution helps with fine detail but is not necessary.

Can I use an IR thermometer instead?

Yes, it just takes longer since you are reading one spot at a time rather than seeing the whole wall.

Buying Guides

Best Thermal Leak Detectors of 2026

Three tiers of tool, three price points. All of them find problems you cannot see; the difference is how quickly.

Updated January 2026 · about 5 min read

Popular picks on Amazon

Thermal Leak Detector InfraredBrowse current prices and top-rated options on Amazon Infrared Thermometer GunBrowse current prices and top-rated options on Amazon Thermal Imaging Camera Home InspectionBrowse current prices and top-rated options on Amazon

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Tier 1 — thermal leak detectors

A point-and-shoot device that lights up blue or red when a surface deviates from a reference temperature you set. Inexpensive, foolproof, and perfect for walking a room finding drafty spots.

Tier 2 — infrared thermometer guns

Reads exact surface temperature at a spot. Useful for comparing wall surfaces, checking duct supply temperatures and verifying insulated versus uninsulated areas. Watch the distance-to-spot ratio — from across a room a cheap gun averages a wide circle.

Gear for this job

Infrared Thermometer GunBrowse current prices and top-rated options on Amazon

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Tier 3 — thermal imaging cameras

Phone attachments and standalone cameras now show whole-wall images. Look for at least 160x120 sensor resolution, adjustable emissivity and image saving. This is the tool that finds missing batts inside a closed wall.

How to use them well

Test with at least a 15°F indoor/outdoor temperature difference, depressurize the house with exhaust fans to exaggerate leaks, and scan slowly. Photograph findings before you insulate so you can verify afterwards.

Run the numbers

Heat Loss (BTU) Calculator Energy Savings Calculator

Frequently asked questions

Do thermal cameras show insulation gaps?: Yes — missing or compressed insulation shows as a distinct cold or warm patch when there is a temperature difference across the wall.
What resolution thermal camera do I need for home use?: 160x120 is enough to find missing insulation and leaks. Higher resolution helps with fine detail but is not necessary.
Can I use an IR thermometer instead?: Yes, it just takes longer since you are reading one spot at a time rather than seeing the whole wall.

Insulation gear worth owning

The tools and materials that show up on almost every insulation job.

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