New and need help with keeping my 55 gal tank warm please.

i have the same size tank, with a 100w bulb on the left, a 75w bulb on the right, and another 10g strip light with 30 more watts in it on the left, my house is around the same temp, and i was having the same problem. i covered my entire lid in 3layers of foil and taped it around the edges of the lid, tho only holes in it are just big enough for the lights, no extra open space. i also wrapped the back and one side in foil shiny side in, and now my temps are back to perfect, even with my room being 65, the glass is even warm to the touch hours after the 100w goes off. hope this helps

To the op. My family is all from millinocket maine and i know the temps your gonna be dealin with this winter. If ya want to keep temps in a big glass enclosure heres a cheap simple fix. Go to home depot pick up a 4x8 sheet of exterior home foam. Its made by dow and its blue on one side and foil on the other. Cut pieces to wrap on the sides and back of the tank. And put a piece on the top and attach it leaving a small gap on one side for air. This will insulate the glass tank. Glass by itself will not hold heat in. The insulation will help stop thermal transfer through the glass. The only glass that has any insulating properties are gas filled dual pane glass and fishtanks do not have this. Now if you get an acrylic tank you will be able to keep heat in better but the insulation will work great on your glass tank

Success!
I ended up keeping him in the 55 gal with these changes:
1) 3 layers of tinfoil and duct tape on the cover. I cut a round opening about a 1/4" larger than the CHE and for now no other openings.

2) I took off the rigid insulation on the sides and back of the tank and put 1 layer of tinfoil on the outside of the glass then put the insulation back on.

3) I put the large UTH on a thermostat and set it to just below medium.

Right now (7 am) my humidity is 50% and the temp is around 78 in the tank and the house temp is 65. I have turned up the thermostat to 1/2 between med and high to raise my temps.

Thanks again for all the help.