Arden Realty

August 15, 2002

Maybeth Rothery

AC Energy Systems, Inc.

224 Birmingham Dr. #1A2

Cardiff, CA 92007

Dear Maybeth:

We would like to take this opportunity to let you know how pleased we are with the CO Systems and Variables Speed Drives you have installed at our buildings.

The projects have been completed in a timely manner and are of good quality. You have provided on-going support and training of our engineers. We consider your service to be outstanding.

The Quantum CO Star CO System and the Unico VFDs you have furnished have been of the highest quality and we would recommend them to anyone seeking energy savings. In fact, the results we have achieved from these systems have exceeded our expectations.

We look forward to working with you again soon.

Very truly yours,

Duane Lappinga, P.E.

Assistant Vice President

Energy Costs Expected to skyrocket in upcoming months. With oil prices at an all time high and a continuous growth in electricity consumption, cutting energy use is a means to improving your bottom line.

(Above: Installation at The Tower in Westwood, LA)

AC Energy Systems, Inc.

224 Birmingham Dr. #1A2,

Cardiff By The Sea, CA 92007