Experts, economists, and industry insiders are predicting a summer slump for housing in the wake of expiring federal support and the spring-selling season. The $8,000 tax credit worked to boost spring sales but may have also urged potential summer buyers into earlier purchases. Stan Humphries, Zillow’s chief economist, says there will be a mid-to-late summer lull in sales because of the increased demand this spring. And though interest rates remain near historic lows, that alone may not be enough to sustain the market’s recent gains in the face of foreclosures and inventory concerns. High unemployment and volatility in the financial markets will also continue to have a negative affect on housing. Toll Brothers chief executive, Bob Toll, sees the beginning of a recovery but says he doesn’t expect housing to roar back right away. Still, there are others that remain optimistic. Joel Naroff, head of Naroff Economic Advisors, sees a slow, but steady, improvement in housing through the second half of 2010. More here, here, here, and here.