Thermal Imaging for Home Inspection: What a Camera Finds and Which One to Buy

How we made this guide: picks, prices and specs come from our catalog and the makers' published specs, owner quotes come from customer reviews on our product pages and every guide is checked and edited by Trevor Hall.

For home inspection, the three cameras we would shortlist first are the FLIR E8 Pro at $2,999, the FLIR E6 Pro at $1,999 and the FLIR C5 at $799. The cameras in this guide run from $499.99 for a phone attachment up to $5,900 for a building-pro camera with a viewfinder.

A thermal camera shows surface temperature patterns. Those patterns can point to missing insulation, air leaks, hidden moisture and hot electrical parts. It does not see through walls, and it does not detect water or mold. Every wet-looking pattern needs confirming with a moisture meter before it goes in a report.

Why a home inspection changes the camera you need

A home inspector scans rooms from a few feet away, in a house the camera has never seen, with a client waiting. That changes what matters. You want a sharp enough image to see where a pattern starts and stops, a screen you can read in a dim attic and a way to put the image straight into a report.

Two numbers decide image quality. Resolution is the count of thermal pixels: a 160 x 120 sensor has 19,200 of them, a 240 x 180 sensor has 43,200 and a 320 x 240 sensor has 76,800 (our calculation, width times height). More pixels means a small spot, such as a wet patch around a pipe, covers more of them and reads as a shape instead of a smudge. Thermal sensitivity, written NETD, is the smallest temperature difference the camera can separate. A lower number is better: under 40 mK separates finer differences than 70 mK, as the maker rates it.

The third feature is MSX, FLIR's feature that lays visible-camera detail over the thermal image. On a wall, it helps you see the stud, the outlet or the window edge next to the pattern, so you can say exactly where to put the meter.

What a thermal camera can and cannot find

A thermal camera reads the surface of what it points at. Inside a house, that surface is drywall, plaster, ceiling board, flooring or the face of an electrical panel. Where something behind the surface changes how heat moves, the surface can show it. That is how a camera hints at missing insulation, air leaking around a window or a hot breaker.

Two limits matter. First, a cold or warm patch is not proof of water. Sunlight, a duct, a pipe or a different material can make the same pattern. Second, a camera cannot tell you mold is present. At most it points to a place where moisture may be, and the meter and your eyes do the rest. For how the drying side works once you find water, see our guide to drying hardwood floors after water damage and our steps for drying wet carpet after a leak.

How we picked these cameras

We picked from the thermal imagers and moisture meters in our catalog. Every spec below comes from the listing's spec rows, and each is stated as the maker lists it. We did not test these cameras. The FLIR cameras have no owner reviews on our product pages yet, so we do not quote any. The Tramex ME5 meter does, and we quote two of its owners below, including one complaint.

Comparison of the picks

Main pick: FLIR E8 Pro

The E8 Pro is the camera we would put in most inspectors' hands. It is our best-selling thermal camera. The listing gives a 320 x 240 infrared resolution (76,800 pixels), a thermal sensitivity under 40 mK at 30°C and a 33° field of view. The screen is a 640 x 480 touchscreen, the focus is fixed and the image rate is 9 Hz. It reads from -4°F to 1022°F and connects to FLIR's Ignite cloud service. FLIR's spec page adds MSX, a 5 MP visual camera and a 4-hour battery.

Fixed focus is a real plus on a job. You point and shoot, with no focus ring to set in a crawl space. FLIR's spec page lists a minimum focus distance of 0.36 m (1.18 ft), so hold the camera at least that far from the wall. Past that the image stays sharp, and what limits a long shot such as a roofline is the pixel count, not the focus.

Skip it if you scan a house only now and then. A 160 x 120 camera costs less and covers occasional work.

Step-up pick: FLIR E6 Pro

The E6 Pro sits between the entry cameras and the E8 Pro. The listing gives a 240 x 180 thermal resolution (43,200 pixels), a thermal sensitivity under 50 mK at 30°C and a spatial resolution (IFOV) of 2.5 mrad. It has a 3.5 inch, 640 x 480 touchscreen, a 5 MP visual camera with an LED lamp and the same -4°F to 1022°F range as the E8 Pro.

The gain over the E5 Pro is clear on paper: more than twice the thermal pixels (43,200 against 19,200, our calculation) and a lower sensitivity figure.

Skip it if you do inspections every week. The E8 Pro costs $2,999 and gives you the sharper image you will use daily.

Pocket pick: FLIR C5

The C5 is the camera to carry when you do not want a second bag. The listing gives a 160 x 120 resolution (19,200 pixels), a thermal sensitivity under 70 mK, a 54° x 42° field of view and a 3.5 inch screen. The visual camera is 5 MP, the focus is free and the battery is a built-in rechargeable lithium-ion pack. The listing gives a 2 m drop test and an IP54 enclosure rating.

The wide field of view helps in tight rooms, where you cannot step back.

Skip it if you need to see small patterns at a distance, or you scan every day. Step up to the E6 Pro or E8 Pro.

Phone pick: FLIR ONE Edge Pro

The ONE Edge Pro pairs with an iOS or Android phone over Wi-Fi, or clips onto the phone. The listing gives a 160 x 120 thermal resolution, a 640 x 480 visual resolution, a 70 mK thermal sensitivity, an IP54 rating and a 6.56 ft drop test. Battery life is 2 hours 30 minutes. It measures 1.4 x 1.5 x 5.9 inches.

Skip it if you want a camera that works on its own, with a case and a dedicated screen.

Entry pick: FLIR E5 Pro

The E5 Pro is a standalone camera with a thermal sensitivity under 60 mK, a better figure than the C5 and ONE Edge Pro. The listing gives a 160 x 120 thermal resolution (19,200 pixels), a 3.7 mrad IFOV, a 5 MP visual camera and a 3.5 inch 640 x 480 touchscreen.

Skip it if you can stretch to the E6 Pro. The jump to 43,200 thermal pixels is the biggest step in this lineup for the money.

Building-pro pick: FLIR E54

The E54 is built for building and condition-monitoring work. The listing gives a 320 x 240 resolution, a thermal sensitivity under 40 mK at 30°C, a 30 Hz image rate, manual focus and 1 to 4x continuous zoom. It has a 4 inch touchscreen, a viewfinder eyecup for bright light, 3 spotmeters and hot and cold spot detection. The listing rates the body IP54, with 25g shock and 2g vibration.

The E54 has the same 320 x 240 resolution as the E8 Pro, so the extra money buys the 30 Hz rate, the viewfinder eyecup, manual focus and the narrower 24° lens, not more pixels. Skip it if you only scan interiors. The E8 Pro gives the same pixel count for $2,999.

Confirm with an imaging meter: FLIR MR160

The MR160 is a moisture meter with a thermal image on its screen. The listing gives an 80 x 60 thermal image resolution (a small image, so it is a pointer, not a replacement for an inspection camera), a 2.3 inch 320 x 240 display, a laser pointer and pinless detection with an external pin probe available. It charges over USB and weighs 7.4 oz.

Skip it as your only camera. With 80 x 60 thermal pixels it cannot show a wall pattern the way the 160 x 120 cameras can.

Confirm with a pinless meter: Tramex ME5

The ME5 is a non-invasive, pinless meter. The listing gives two depth settings, shallow to 3/8 inch and deep to 1 1/4 inch, and a 5 to 30 percent moisture content range for wood. It works on wood, drywall, plaster, tile, masonry and roofing membranes, runs on a 9V battery and weighs 8.4 oz. It pairs with the Tramex Meters app on iOS and Android.

It has 4.88 stars from 16 reviews on our product page. Two reviewers say they use it on home inspections, and one of them wrote:

“Too expensive for a random homeowner, but I use this quite a bit for home inspections. It is simple, and to the point and I like that. Works great and the case is solid to fit in my bag of tools and not get damaged.”

Tramex ME5 owner · 5 out of 5 stars

One owner who rates it 4 stars, and says it has been great so far, flags a limit that matters in a dim attic or crawl space:

“My only complaint is that the analog dial does not have any sort of backlight or LED to illuminate it. This meter does not work in dark environments.”

Tramex ME5 owner · 4 out of 5 stars

Skip it if you only do occasional checks and want one tool. The MR160 combines a small image with a meter in one body.

How to scan a house with a thermal camera

Start with the conditions. FLIR's guidance for air leak and insulation scans calls for at least a 10°C (18°F) difference between inside and outside, so scan on a cold morning with the heat on or on a hot afternoon with the AC running. Moisture shows as a subtle pattern, so FLIR suggests narrowing the image span to about 10°C to 20°C instead of leaving the camera on auto range. A leak shows only while the material is wet, so a roof or window leak is easiest to find after rain.

1. Walk the house with the camera first. Scan walls, ceilings, floors, windows, doors and the electrical panel, and note every pattern with a photo. A breaker shows heat only while its circuit carries load, so switch on lights and appliances before you scan the panel.
2. Use the visual image to locate each pattern. MSX or the visual camera shows the stud, outlet or window edge beside it.
3. Scan from more than one angle. A reflection from a window or a shiny surface moves when you move. A real pattern stays where it is.
4. Read each pattern with a moisture meter. Press the meter to the area and compare it with a dry wall of the same material.
5. Note the result in the report with the image and the meter reading. Do not write that a camera found water or mold.

A cold spot with no moisture behind it, such as a wall with less insulation, is one to rule out, and a meter reading separates the two. For the drying side, see our guide to drying wet carpet.

If you plan to offer thermal scans as a service, take a thermography course first, and record the indoor and outdoor temperatures and the weather with every scan so a client can see the conditions behind each image.

Video: the E8 Pro and the ME5

Frequently asked questions

Is a moisture meter or thermal imaging better?

They answer different questions. A thermal camera shows you where a surface differs in temperature. A moisture meter reads whether the material is wet. Use the camera to find the place and the meter to confirm it. Our moisture meter vs thermal camera guide goes deeper.

What can thermal imaging find in a home inspection?

Insulation gaps, air leaks around openings, possible moisture and warm breakers or connections. It is a screening tool, so findings are checked another way before they go in a report.

Can a thermal camera find a water leak?

It can point to a place where a leak may be, because wet material can read differently from dry material around it. It does not see the water. Confirm with a meter.

Which thermal camera is best for water leak detection?

One with fine sensitivity and enough pixels to give a wet patch a clear shape. FLIR's own leak guide names the E6 Pro for basic work and the E8 Pro for higher resolution, and both list 50 mK or lower. Pair either with a moisture meter, because the camera only shows where to read.

Can a thermal imaging camera detect mold?

No. A camera shows temperature patterns. It can point to a moisture pattern, and moisture is one of the conditions mold needs, but it cannot tell you mold is present.

What is the best IR camera for electrical inspections?

For a home panel, any camera here shows a breaker running warmer than its neighbors once the circuits carry load. The E6 Pro and E8 Pro read up to 1022°F, and the E54 adds manual focus and a 24° lens for gear you cannot get close to. Report any hot spot for an electrician.

Which thermal camera should a new home inspector buy?

The FLIR E8 Pro at $2,999 if you will scan every job. The E6 Pro at $1,999 if you want a lower price with more pixels than the 160 x 120 cameras.

Does resolution matter more than sensitivity?

Both matter. Moisture and insulation patterns are often subtle, so a low NETD helps you see them at all, and more pixels then give the pattern a clear shape. Compare both numbers, with the maker's condition for each.

Related guides

• Pin vs Pinless Moisture Meters: Which One Should Restorers and Inspectors Buy?
• Moisture Meter Readings Chart: Normal Levels for Drywall, Wood and Concrete
• Best Moisture Meters for Water Damage, Drywall and Building Inspection
• Hardwood Floor Water Damage: How to Dry the Boards Before They Cup