A union leader said it was "disgraceful" that MPs were claiming expenses for heating their second homes while families were struggling to pay energy bills.
Dave Prentis, General Secretary of Unison, told the Sunday Mirror:
It's disgraceful that well-paid MPs should claim expenses for heating costs at the same time that thousands of families are struggling to pay to turn the oven on to cook dinner for their families.
These are the same hypocritical MPs who have failed to get a grip on soaring fuel and energy costs, rising food bills and pay freezes.
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
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The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.