Request Estimate Request an estimate on a new heating & cooling system, a ductless mini split or a QuietCool whole house fan in San Diego CA from 5 Diamond Mechanical. Call us at 1-833-353-HVAC or use the form below: Contact Us Name* First Last Email* Phone*Address Street Address City State ZIP / Postal Code Are you a new or existing customer?* New Existing Request for* Installation Estimate Service Maintenance Comments or Details