Since your in San Francisco you probably want an energy auditor.  They visually inspects buildings and related systems including mechanical, electrical, and process systems to determine energy consumption in each area or system. They prepare reports that can sometimes save you on your yearly energy bills.

You can find an up to data list of energy auditors on the SOMAH program website, but the top results is:

> Abraxas Energy Consulting
> Clayde Barkley
> 805-547-2050 
> smah@abraxasenergy.com 
> http://www.abraxasenergy.com
> *AEE Certified Energy Manager
> *Professional Engineer
> San Diego Gas and Electric (SDG&E® ), Southern California Edison (SCE® ), Pacific Gas and Electric (PG&E ® ), Liberty Utilities, PacifiCorp


In particular you may want to contact a few and use their listed contract details to ask for a quote. Be clear about what you want to achieve and provide as much building information you have to make it easier for them to give you a quote. You should include some initial information on the building like type, size, year, and so on and they may ask you for more in follow up questions.

The more information you give them the better their recommendations and the cheaper the job. If you provide them no information their recommendations will have little use unless they do an expensive site survey. You may want to find and prepare information on the building blueprints, design, modifications, and construction.

It's best if you can find reviews or get recommendations from a experienced friend as the price in only one point of comparison. You may consider asking the SOMAH hotline as it's managed by the government and there is some expectation that it will provide unbiased information. A residence association or building management firm may also be a good choice to ask as they are potential customers of energy audits.
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