Selecting wattage for outdoor shelter

Joined
May 16, 2024
Messages
17
Location (City and/or State)
Cary, North Carolina
I have built a 2' x 4' outdoor shelter which will be located under our deck (although not up against the house) in our outdoor enclosure. I'm planning on running a Vivarium Electronics radiant heat panel on a VE-200 proportional dimming thermostat. I live in North Carolina, zone 8a which technically means average annual extreme minimum temperature of 10-15* F. Typically, throughout the winter we will get lowest lows around 25 - 35. Rarely lower, often higher (50's). Daytime high temps are almost always above freezing, usually 40s - 50s, sometimes as high as 70s. Pictures of the house structure for reference are below. It has R 7.5 insulation (2 x 3.75) and 3/4" boards on the outside and inside (inside boards not seen in construction pics below). Right now I don't have any plastic curtain over the entrance but I'm considering adding it.

This will be for a Hermann's tortoise. My strategy is to allow the tortoise to brumate, so from what I can tell, I really only need to maintain temps around ~45 *F. However, given that we often have weather much warmer than that throughout the winter, the tort may not be in proper brumation some or all of the time (?). So not sure if I actually need to be targeting a higher temp.

1. In general, is my strategy of RHP + proportional dimming thermostat the preferred path forward?

2. What wattage RHP do I need? They offer 28, 40, 80, and 120. I dont mind getting the biggest one since it will be on a proportional dimmer, just to have the capacity in case I need it (especially in the event that the tortoise "wakes" during a mild week in January and then temps drop again when it is not brumated). Any downside to that strategy?
 
Joined
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Location (City and/or State)
Cary, North Carolina
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S2G

Active Member
Joined
Feb 21, 2021
Messages
149
Location (City and/or State)
AL
Thats something id do more for like a sulcata night box. Hermanns will be just fine without all that. RHP's are sized per cubic ft though & designed for room temps.

Im in AL, but i have a good bit of experience with eastern hermanns. I provide deep double shade & an underground hide for our summers. Winter time I use to use cold frames on a house like you built, but our winters are crazy inconsistent with temps so i always worried about one of them getting out & freezing. I skip brumation if they act funny or i just got them.

What im doing now for is chemnerds brumating process. After they settled down for the season you put them in a box where they can bury & then i keep them at 40F on a temp controller that kills things before it freezes. I have a little fridge setup in the garage now from end of nov to march.
 
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