best evidence would be to look at the softer plastic parts on the bikes – tyres, grips, drivetrain parts, shifters etc.
If these are melted then there could be cause for concern. The carbon fibre depends on the resin and cure temp. I would think you would be safe for 120+ up to 180degC. At those temps I would expect to see other bits suffering before the carbon.
Things like paint blistering and melted plastic on the hard tail would lead me to worry about the condition of fork and brake internals (oil and seal temps).
At very least you may want new tyres on the road bike if there is any evidence it got very warm.
If there is any doubt then they will probably go the way of new bikes and I think the bike in the same room would likely be highly suspect having seen the effect of fire on items in the same room.