June comfort and cost report
Cold, cloudy days in June were a good test of the energy cost for active heating to remain comfortable indoors. The total energy bill to live comfortably in our high-efficiency, all-electric home was a reasonable $2.50 per day. Read More
May comfort and cost report
During May, the colder, cloudier days meant the house changed from passive to active heating mode. The air conditioner was handy to keep the indoor temperature within the target comfort range. Less solar power production and higher electricity consumption left us with a $43 energy bill. Read More
April comfort and cost report
April marks the end of a long run of days of excess solar power exports and passive cooling. Shorter, cloudier days reduce power production. Colder temperatures mean the house has moved to passive heating, with just a touch of active heating using the air conditioner. It's still comfortable indoors but the monthly energy cost is expected to rise from here. Read More
March comfort and cost report
March is a tricky month for a passive solar home. With the Sun lower in the sky, the increasing amount of sunlight hitting the concrete slab is moving the house into passive heating mode. However, the occasional flashback into Summer means the heating isn't required. Covering the pergola with a deciduous vine should eliminate the issue in future. Read More
February comfort and cost report
Passive cooling with nighttime natural air circulation was all that was required to maintain a comfortable temperature indoors. Solar power production remains high with exports ensuring our energy bill was a slight credit. Read More
December comfort and cost report
Despite increasing temperatures, passive cooling was all that was required to keep indoor temperatures within a comfortable range. The energy bill for December was a credit of $8 due to continuing low household demand and increased solar power production. Read More
November cost and comfort report
Despite Melbourne's temperatures swinging from Summer to Winter and back again, the house maintained a comfortable indoor temperature with minimal use of mechanical heating. Read More
October comfort and cost report
Longer, warmer days reduced the need for any form of heating to keep indoors at a comfortable temperature. The extra sunshine increased solar power production so we had more than enough electricity for household demand and charging EVs. Read More
September comfort and cost report
As the days and nights become warmer, less mechanical heating is required to assist passive solar heating (plus insulation) to maintain a comfortable temperature indoors. Increased solar power exports and decreased grid imports reduced the energy bill to 50c per day. Read More