I do the old fridge thing too. Most places that sell fridges when they have to pick up and take away the old one. They are stuck with it and have to pay to get rid of it. Thats how I got mine they were more than happy to give me one. I got a little upright freezer. Its about 5 foot tall. 2 foot wide 2 foot deep. Then you have to buy the tubs. The heat tape I use 2 pieces 1 almost as long as the freezer is tall. Then another about 2 foot long. The most I had to spend was on a good thermostat. I use a Helix too. I have used it for 3 seasons now. It has worked great. Think it was 135.00 or so.
Anyways I would go that way. Even if your not producing 30 clutches a year. The freezer or fridge type incubator, you will be able to grow into it. If your only having a few clutches a year. Then you bump that up to say 5 or 10 you should have plenty of room and wont have to build another incubator every year.
Here are a few pics they are a bit older. Before I added the other piece of heat tape. I also took out the thermostat thats in the freezer. I also added two pc fans after the pictures were taken.
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