Insulating the dome

This afternoon a contractor came out to shoot the dome with a 2 part urethane foam insulation and rubber coating. The insulation is applied with a sprayer much like a paint and as it cures, it expands (foams) up and hardens. The foam gets pretty hot as it foams and cures. We had about 3-4 inches of foam insulation shot on before the rubber coating was applied and sealed everything up. The dome remains a pretty constant temperature during the day. With no cooling, it's at least 10-15 degrees cooler inside the dome than it is outside. Once we have a vent installed in the skylight we'll be able to vent at night and then close everything down during the day and keep it cold...