“The polar vortex that arrived earlier this week has for days disrupted life across an entire region. Deaths and injuries were reported. Decades-old records fell. And, for one more day, even stepping outside remained a painful, risky experience.
In New York City, where it was 10 degrees at midday, Mayor Bill de Blasio urged people to “bundle up and stay inside as much as possible.” With wind chills expected to fall below zero, city officials warned landlords to provide adequate heat to their tenants.”
(New York Times, Jan. 31, 2019)
Our Passive House performance during the Polar Vortex was unbelievable. The heating energy needed for this extreme weather event was not even above a normal winter day. The Polar Vortex was no match for our Passive House and heating cost for that day was less than one dollar.
The total energy used for heating by the mini-split system for that day was 5.5 kWh. The HVAC system turned on 11 times and ran overall for 2h 51min 53s.
The total energy used for hot water was 14.3 kWh. The heat pump DHW system turned on 25 times and ran overall for 2h 57m 40s.