Do my chicks need more space?

[rosemarythyme]

If cobbling together a larger brooding area isn't feasible, I'd see about giving them as much outside time as possible, since your temperatures are high and your chicks aren't newborns. It'll help them transition to living outside full time as well. Just make sure there's somewhere secure that they can play in, with shade/wind protection and of course food and water.

When moved to the coop will they need a heat lamp at night at 4-5 weeks old? Low temps are in the high 60’s/low 70’s at night, 80’s/90’s during the day.

They won't need heat by that point as long as you keep reducing the amount of heat they're getting in the brooder. I aggressively wean chicks off heat and at 4 weeks old they're off completely with lows in the 40s.