AC InfinitySUNCORE S3, Waterproof Seedling Mat with Heat Controller 10" x 20.75", UL & MET Certified Heating Pad, for Indoor Gardening, Hydroponics, Germination, Cloning

Does its job. Amazing. Still works after years.

I used this very basic heat mat to warm some transplants to stimulate root growth and it works well.You plug it in, under the little greenhouse dome you may be using and the gentle heat from the mat does the rest. It's basic and it works well with no complaints .Did not monitor temperature, so I took it at face value, nothing was over-heated or damaged, so it's fine.Just needed to provide steady heat to my cuttings and did not go the whole "scientific" route of monitoring, just plug and play.Very basic, works fine IMO and I'd buy one again, and recommend for simple, basic needs.

I wish I got this sooner. It makes germination much easier. No more looking for a warm spot to put the seeds while they germinate in a towel. This is water resistant and very durable. The controller is very simple and easy to use. I never need to go above medium heat. If you are working with clones, this is also a must have. It makes propagation a breeze. It adds just enough warmth to create the right amount of moisture in the enclosure.

This is a basic heating mat but it does have a control that allows you to pick a general range of heating. It's not thermostatically controlled, that's a more expensive item if a thermostat is built in or if you're by a separate thermostat to control the mat. It has a control that allows setting it to a certain range but there's no thermostatic control that is measuring to see what temperature you're actually getting and giving feedback to raise or lower the temp. But it did the trick for me. Based on the reviews from other people I put it on a piece of cardboard which helps keep the heat going in the right direction. I used a thermometer to test the temperature of my soil after it was on for a few hours, adjusting the dial upward and downward to get the temperature I was looking for. These heat mats don't have a specific temperature as much as they have a differential above the ambient temperature in the room. So this heat mat is unlikely to start peppers in a cold greenhouse. But in my house it worked great and the price was right.

Came with a nice-quality booklet on growing weed. Not my interest, but nicely done.AC Infinity has a lot of quality in their workmanship and packaging. This is a seedling mat, there's not a lot to say, but:It has a nice bag for storage, which is a nice touch.It has a high/medium/low knob that is *smoothly* adjustable (not just three positions).It kept my baby ducks from dying of cold, without using a ton of power, so there's that.Note: for keeping critters warm, use a thick layer of insulation/bedding (hay, sawdust, or similar) underneath the mat, but only a thin comfort layer on top of the mat, so the heat gets through. Even a small amount of consistent heating can get very hot if well-insulated on both sides, so monitor temperatures well, and don't put enough bedding on top that it acts as an insulator. Also, always make sure your critters have unheated space available, so they can cool off.

I was surprised by how good the quality of this mat is. The adjustable temperature really works, I tested the temperatures before trying the seeds on it. Low is barely warm, high is a little too warm even for my chilly basement, and I found that about 1/3 past medium turned out perfect. Almost all of my bell pepper seeds came up.I just ordered another of these so I can start the rest of my seeds at once. I am completely new at starting plants from seeds but this makes it easy. I highly recommend this mat!

Everything AC Infinity makes is very dependable and designed to work. This heat mat is thermostatically controlled and heats consistently.

start on low and use a thermometer! bought for seed starting in peat pellets. first day, made the mistake of using the high setting on the mat plus the grow light, after a few hours I measured the peat at 100 degrees which is too hot. room was only 65 degrees. i turned the mat down to lowest setting that night, in the morning the peat was about 70-80 which is a good temp. with the light on again and the mat at low setting, after a few hours it was up to 90 degrees which is still a bit too hot. so now I am using the mat only when the light is off and at low setting. definitely glad I got this mat with the temperature control.