Contact Information Our FREE home energy assessment audit can lead to impressive savings. Mallard Energy Systems, Inc. 60 Willow Road Ayer, MA 01432 Telephone: 978-621-1509 Fax: 978-796-5352 No obligation. No contracts. No Fees. Contact Us Today! First Name * Last Name * Email * Phone * Massachusetts City: * Questions & Comments: * *Denotes Required Fields