Levenhagen, John I <br/><br/>
HVAC controls and systems 
John I. Levenhagen, Donald H. Spethmann 
 - New York  McGraw-Hill  c1993 
 - xiii, 334 p.  ill.  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0070375097 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air conditioning--Control<br/>Heating--Control