It is not everyday that you buy a refrigerator or washer and dryer set. So, when that moment actually hits, you’ll want to know for sure whether you are getting the very best price. Decide.com today is launching a new service to help consumers sort through the clutter around home appliances, telling would-be buyers if the prices will rise or fall.

“Prices on home appliances, like electronics, are highly volatile,” notes CEO Mike Fridgen, a former executive at Seattle online airfare search startup Farecast. “In fact, on a given day, prices change on 12 percent on appliance products.” Fridgen notes that half of the changes are price increases, while the other half are price drops.

In addition to big items like refrigerators, Decide.com is adding price recommendations for countertop appliances like like espresso makers, blenders and stand mixers

Mike Fridgen, CEO of Decide.com.

When prices drop, Decide.com notifies customers, which Fridgen said can mean significant savings on major appliances.

To date, Decide.com has focused on consumer electronics, telling consumers whether they should buy or wait on TVs, phones, laptops and other gadgets.

With the expansion into home appliances — a 3X increase in products — Decide.com is opening up an entirely new market. I’ve yet to see how the new service works, since I was unable to find the new listings on the company’s Web site this morning. (UPDATE: Fridgen tells us that the new home appliance offering will be on the site later today).

Decide.com raised $6 million from Maveron, Madrona, early Google investor and former Amazon.com executive Ram Shriram; former Expedia CEO Erik Blachford and former Farecast CEO Hugh Crean last April. It was developed by the team that created Farecast, the online travel service that instructed consumers on the best time to buy airline tickets. Farecast was purchased by Microsoft for $115 million.

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