Elon has said the Semi will have about a one-ton weight penalty versus diesel. If weight is added for a sleeper cab, it will still be a one-ton penalty -- no difference (maybe a little less since Tesla is very good at finding ways to reduce weight).
As for A/C and heat, Tesla has already developed highly efficient HVAC systems for its vehicles. In fact, Elon has mentioned many times that Tesla may even get into the home HVAC business. Other amenities for a sleeper cab shouldn't be that difficult.
Since the first couple years of the program will probably involve relatively low volumes as big companies test out prototypes before making large orders, there is probably no urgency for Tesla to roll-out a sleeper version. But I think it's a mistake to be thinking about the Semi as limited to short-haul. Tesla is definitely going after the long-haul market IMO.
As for A/C and heat, Tesla has already developed highly efficient HVAC systems for its vehicles. In fact, Elon has mentioned many times that Tesla may even get into the home HVAC business. Other amenities for a sleeper cab shouldn't be that difficult.
Since the first couple years of the program will probably involve relatively low volumes as big companies test out prototypes before making large orders, there is probably no urgency for Tesla to roll-out a sleeper version. But I think it's a mistake to be thinking about the Semi as limited to short-haul. Tesla is definitely going after the long-haul market IMO.