AC Infinity SUNCORE S3 heat mat
The SUNCORE S3 uses a variable-output dial in the same 10-by-20.75-inch footprint rather than the H3’s digital display.
Read our take
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Seedling Heat MatsOUR TAKE
AC Infinity SUNCORE H3 heat mat
A 10-by-20.75-inch heat mat with a digital temperature controller.
H3 is the more useful choice when a temperature readout and adjustable setpoint matter in the propagation plan.
- Good for
- A suitable indoor seed-starting arrangement needing digital mat-temperature control.
- Look elsewhere if
- A simple variable-output dial covers the intended job.
- The tradeoff
- The controller reads the mat arrangement; plant care still needs the right growing conditions.
At a glance
- Mat
- 10 x 20.75 inches
- Control
- Digital temperature display and adjustable setting
Why it earns a look
- 10 x 20.75 inches.
- Digital temperature display and adjustable setting.
Where it asks for a compromise
- The controller reads the mat arrangement; plant care still needs the right growing conditions.
Make a workable growing bench
H3 is the more useful choice when a temperature readout and adjustable setpoint matter in the propagation plan. Plan access for watering and observing the plants as well as the equipment footprint. Keep the settings appropriate to the crop and stage of growth.
Living with it in the garden
Use settings and placement under the equipment instructions.
Manage ventilation and moisture for the propagation stage.
Which one belongs in your shed?
AC Infinity 72-cell light-and-mat dome kit
The 72-cell dome kit includes a mat alongside LED bars and trays when you need the complete seed-starting arrangement.
Read our takeYour AC-SMH3 questions
What is the main format?
A 10-by-20.75-inch heat mat with a digital temperature controller.
Is the equipment setting a substitute for plant care?
The crop still needs suitable conditions, moisture, and ongoing attention.
Full specifications, manuals & sources
Model details
- Full model name
- AC Infinity SUNCORE H3, Seedling Mat 10” x 20.75” w/ Smart Heat Controller
- Amazon ASIN
- B0D94XY74G
- Power source
- Corded electric
- Brand
- AC Infinity
Manuals & product information
Photo sources
Product information checked 2026-10-29. Our assessment uses the linked specifications and manuals; it does not represent a hands-on test. Editorial standards & corrections.