Youre biggest prob would be trying to keep your room at 77 degree.
4 x 600w in cool tubes maybe, with an inline fan for two like this pic using 2 x 1000w and one fan.
Venting into your house is ok during winter, but in summer that air will heat your house up something bigtime (4 x 600w). Pushing the heat from the cooltubes under the floor would be the best, if there is a cavity under there. Or into the roof if you have to.
If you do vent into your house I would suggest you also have an extractor fan at the other end of your house pulling used air out. Doesnt have to be a big fan like what you would need in a grow room, youre not dealing with smell, just keeping that air in your house moving.
The air gap between your grow room and the walls will dissipate any potential hot spots on the outside walls if you are concerned about FLIR.
Just remember, FLIR sees the infrared heat signature of the outside wall of your house.
You could also put a temperature gauge in the room outside the panda box grow area too, and watch them, you would want to keep them down to a reason level, and you should be fine. Heat buildup outside your grow box will make it harder for you to keep temps in your grow room down during hot summer days.
Im sure you also know how to vent out, just thoughts running through my head about your plans.
Anyways good luck on your venture.