David Crosthwait,Jr.

Crosthwait invented something that we all are glad to have. We use this system in the summer and the winter, or just when ever we need it. He invented the HVAC. Which is the heating ventilation and air conditioning. It all came about when he studied heat transfer and steam transport, as he went into a deep concentration study he put all of his thoughts together and he created the HVAC. If he was still living and you had to write a thank you letter what would you say to him, because he is a big help to us all today.