Researchers studied 4,600 people, noting the temperature of their home and their blood pressure.  

They found that the average blood pressure for people in the coolest homes was 126.64/74.52, while those in the warmest homes averaged 121.12/70.51 mmHg.

While the researchers didn’t pinpoint a temperature for a “warm enough home”, they do suggest that about 70 degrees Fahrenheit, is ideal.