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🌡 Home Energy Guide

Smartphone Thermal Cameras for Finding Drafts

Published October 2026 · Last verified October 2026

What the Camera Shows YouSurface heat, painted in colorOn screenMeansBlue / purpleCold surfaceA draft or leakRed / orangeWarm surfaceYour heat,stayingCold haloAround a windowSeal the frameCold wall patchMid-wall chillMissinginsulationIt reads surfaces only -- it cannot see through walls or anything solid.
What the colors mean — and what each cold pattern is telling you.
Buy One, or Not?A few ways to get the drafts foundHow often will you use it?Drafty house,every winter?Buy one thatfits yourphoneJust want itfound once?Borrow, rent,or an energyauditRather notfuss at all?Have someonebring one andscanThe camera only finds leaks -- the savings come from the sealing you then do.Illustration - a schematic, not to scale. Your setup may differ.
Buy one, borrow one, or have someone scan for you.

A small camera that clips onto your phone turns cold drafts into bright blue streaks around windows, doors, and outlets — so you can seal them before the cold bills arrive. Want a scan? (330) 200-8042.

Bill Davis
Bill's Home Tech · Atwater, Ohio
Want the full deep-dive?
Download the printable 29-page guide
PDF · 29 pages · plain English · no ads · made by Bill
What It Shows
Surface heat, in color
Best Day
Big inside/out temp gap
Rough Price
$150-$400 (confirm)
Not
An X-ray — surfaces only

A small camera that clips onto your phone turns cold drafts into bright blue streaks around windows, doors, and outlets — so you can seal them before the cold bills arrive. Want a scan? (330) 200-8042.

What's inside this guide

The printable PDF walks through 22 short chapters, in plain language. It also includes at-a-glance pictures.

  1. ! Read this first — it sees heat, not through walls
  2. The short version
  3. What a thermal camera actually shows
  4. Phone add-on vs. standalone camera
  5. Buy the one that fits your phone
  6. Pick the right day to scan
  7. How to read the colorful picture
  8. The usual suspects to scan
  9. Sealing up what the camera reveals
  10. Two ways people come to this — and both are fine
  11. Honest limits — what it won't do
  12. Other handy jobs around the house
  13. Getting the app working
  14. Common mistakes
  15. Is it worth the money?
  16. Scanning a parent's home
  17. How it fits a whole-home energy plan
  18. Where to buy, and what to skip
  19. Your draft-hunt checklist
  20. Common Questions
  21. The quick recap
  22. You don't have to do this alone

Get the printable guide

Everything above is a quick summary. The full, printable guide — the same words, laid out to read and keep by the computer — is a free PDF.

Download the printable PDF →

Last verified October 2026. Information accurate as of October 18, 2026.

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✍️ Every guide researched, written, and reviewed by Bill — your local Portage County tech.

Any prices or outside products mentioned in this guide can change over time — the details here were last checked October 2026 and this page is accurate as of October 18, 2026; please confirm current pricing before you buy. See how often we review our guides →