Forgot Password? Click Here

In addition, please enter your utility service address:

I will do this later

Already have an Efficiency Works Store account? Please Log In.

Shipping and returns

How to return an item

You may request a return of most new, unopened items within 30 days of delivery for a full refund. The website administrator and supplier of Efficiency Works Store, AM Conservation (AMC) will pay the return shipping costs if the return is a result of our error (you received an incorrect or damaged item, etc.).  

If you need to return an item, please contact us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order. If you have created an account on the Efficiency Works Store you can also submit a return request but visiting your accountpage. 


  • Items must be returned within 45 days of invoice to be eligible for credit. 

  • Returned items must be received by AMC in new condition and in the original packaging to be eligible for a refund. 

  • AMC will send you Return Merchandise Authorization (RMA) documentation which must be placed inside the return shipment package and RMA number printed on each package in order for returned material to be received at AMC.
  • Return shipping cost is the responsibility of the customer unless the return is a result of an error made by AMC, in which case, AMC will send you a FEDEX shipping label. 


Shipping to the utility service address is preferred, but alternate shipping arrangements can be made if completed prior to order placement. If you are in need of a shipping address update, please call 855-314-9968. Please note, orders cannot be shipped outside of Colorado.

A confirmation email will be sent with the tracking code after your order has shipped. 

Products may ship separately.

 For any questions regarding returns or shipping please call 855-314-9968.  

Eligible time period: 30 days from delivery date

Non-eligible items: opened or installed thermostats, caulks, foams, mastic, tapes, and items that are not in original condition 

We want you to be satisfied with the products purchased from us, but are unable to refund products that have been installed, for which the original packaging has been destroyed, or that are otherwise not in original condition and resalable. You are responsible for returning products in a safe, unbroken condition, so please pack returns carefully and consider adding additional insurance to return package shipments. Upon receipt a credit equal to the product purchase price will be issued to you through the same payment method you used to pay for the order.  

Incorrectly shipped orders

Eligible time periodInspect your order within 2 business days from delivery date. If you received items you did not order, we will either send you prepaid FedEx shipping label for you to return the incorrectly shipped merchandise. We will ship a new order for the correct merchandise within one business day.

Damaged item returns

Eligible time periodInspect your order within 2 business days from delivery date. If an order has arrived damaged you should notify the supplier, AM Conservation (AMC), within 2 business days of delivery date. AMC will ship replacements at no cost.  Some items, such as smart thermostats, will need to be returned to AMC prior to a replacement being sent. AMC will notify you if any of the damaged items need to be returned and will send you a prepaid FedEx shipping label to do so.

Defective item returns (smart thermostats)

If smart thermostat is deemed truly defective by the manufacturer, NOT incompatible, contact the thermostat manufacturer to discuss replacement. See below.


Defective Google Nest:



Defective Ecobee:

Call: 1.877.932.6233



Defective Sensi: 

Call: 1.888.605.7131  


Defective Honeywell: 


Call: 1.800.633.3991 


Defective Mysa: