Optimizing Heating with Degree Days in Home Assistant

I’ve been diving into optimizing my heating system, and I wanted to share a method that’s been working wonders for me. Using Degree Days (DD) to benchmark energy consumption has been a game-changer. It’s not just about tracking the outdoor temperature but also understanding how your heating system responds to it. Here’s how I’ve set it up and what I’ve learned along the way.

How It Works

  1. Track Target Temperatures: I average the desired temperature of each room throughout the day.
  2. Outdoor Temperature: Similarly, I average the outdoor temperature to get a daily figure.
  3. Energy Consumption: I track gas usage daily.
  4. Calculate Degree Days: The formula takes the difference between the target and outdoor temps, ensuring it never goes below zero.

Why It Matters
This approach helps me fine-tune my heating algorithms. For instance, I noticed that adjusting the target temperature by just a degree could significantly reduce gas consumption without affecting comfort. It’s all about finding that sweet spot where efficiency meets warmth.

Getting It to Work
I used the Average Sensor integration in Home Assistant, which made the calculations much smoother. Here’s a snippet of my configuration:

yaml
sensor:

  • platform: average
    name: average_daily_outdoor_temp
    start: ‘{{ now().replace(hour=0).replace(minute=0).replace(second=0) }}’
    end: ‘{{ now() }}’
    entities: sensor.my_outdoor_temp_sensor
  • platform: template
    sensors:
    degree_day_daily:
    friendly_name: “Degree day daily”
    unit_of_measurement: ‘DD’
    value_template: >
    {{ [0, states(‘sensor.average_daily_target_temp’)|float - states(‘sensor.average_daily_outdoor_temp’)|float] | max | round(2) }}

Results So Far
Since implementing this, I’ve seen a notable reduction in gas usage during colder months. It’s also given me insights into which rooms might need better insulation or heating adjustments. The best part? It’s all automated, so I don’t have to manually crunch numbers every day.

If anyone has tips on further optimizing this setup or alternative methods for tracking energy efficiency, I’d love to hear them! The community here is amazing, and I’m grateful for all the shared knowledge that made this possible.