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Equipment sizing according 90.1 Appendix G?

Equipment sizing according 90.1 Appendix G?

(OP)
hi all
 I was wondering if somebody could share some insight to the ASHRAE 90.1 Appendix G3.1.2.2 point regarding heating and cooling equipment sizing based on building energy simulations. It is stated that the equipment should be oversized by a factor of 1.25 for heating and 1.15 for cooling. Are these "safety factors" based on the uncertainty associated with building energy simulations or a requirement that makes sure that the system can respond quickly enough during startup? Why are there different factors applied for heating and cooling?
thanks!
Milda

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