In the United Kingdom, hotter summers are pushing more homes into dangerous, exhausting conditions, and some residents are discovering that heat pumps can do more than warm a house in winter. Andrew Ingram, who lives in Maidenhead, Berkshire, said his system can keep the living room at 70 degrees Fahrenheit (21 degrees Celsius) even when temperatures outside reach 95 degrees Fahrenheit (35 degrees Celsius). Here's what to know After he and his w…