Here’s information on the MOST COMMON question I’m getting this spring…
Now is a GREAT time for home updates if you live in Austin (I recommend Corias Homes, Inc. if you need help, Debi 512-848-3127/deborah@coriashomes.com).  There are check-in-the-mail rebates available for qualifying homes in Austin and additional rebates were just rolled out:

NEW: Texas Powerful Smart, http://www.texaspowerfulsmart.org/
Details: Reserve your rebate now online, then shop April 16-25 to be eligible for:
•  $240 on an Energy Star–rated refrigerator;
• $180 on a freezer;
• $110 or $140 on a dishwasher;
• $600, $800 or $1,000 on a central air conditioner;
• $1,200 to $1,600 on an air-source heat pump;
• $190 to $640 on a hot water heater; or
• $45 on a room air conditioner.

Austin WaterWise, http://www.ci.austin.tx.us/watercon/default.htm
• $200 for replacing your pre-1996 toilet; *
• $150 for replacing your old clothes washer; *
• $30 for installing a rain-barrel;
• up to $500 for rainwater harvesting equipment;
• up to $375 for irrigation equipment;
• $100 for a pressure reduction valve.

Texas Gas Service, Conservation Program
• $300 per tankless water heater; *
• $40 for a high-efficiency water heater;
• Up to $300 Attic Insulation rebate;
• $.08/sqft for duct sealing;
• $125 for each Hydronic heater;
• $75 for a new furnace;
• $65 for a gas furnace tune-up.

There is also an off-your-taxes Federal rebate of 30% of the cost of certain energy-efficiency upgrades to your principle residence (up to $1500) for things like insulation, HVAC, windows & doors, water heaters, and roofing (read more here: http://www.energystar.gov/index.cfm?c=tax_credits.tx_index).

Happy rebating!

* Indicates that we know this one works through personal experience or from Corias Homes, Inc..