With that many chicks, you, and the chicks, would be far better off brooding right inside your coop or run, provided it's covered and weather protected.
Those of us who have brooded indoors will tell you that by the end of the first week, those chicks can be real stinkers, literally. And twenty-six chicks are going to drive you right into a motel to get away from it.
By age four weeks, your chicks will need to be out in the coop anyway, so why not start them out there? Chicks can be brooded anywhere as long as they're protected from wet weather and cold drafts and have a reliable heat source. They do not need to be in a temperature controlled environment. As long as they have a place to warm up as they lose body heat, the rest of their space can be any temperature.
Chicks benefit far more from being raised in cool ambient temps than when they are coddled by an overly warm environment. My chicks brood in my run under temps down in the 30s at night and in the 50s(F) during the day. They do splendidly.
Read about it in my article on outdoor brooding linked below.
