How to combine furnace and A/C power in energy panel

Configuration
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I’m using the Emporia Vue with ESPhome to track my energy usage. I have two entities that are tracking the furnace and A/C

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When the A/C runs the furnace also runs to circulate the air. So I want to combine those two entities into one. I did that using a sum helper

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I can add the separate air conditioner and furnace sensors to the energy dashboard with out a problem, but when I try to add the combined sensor I get the errors “Unexpected device class
The following entities do not have the expected device class” and “Last reset missing
The following entities have state class ‘measurement’ but ‘last_reset’ is missing”

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Is there any way to add the combined entity using the sum helper to the energy dashboard?

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I’m still working on this but can’t seem to figure it out. I’ve seen other posts where people have used templates, but that’s not working for me either.

I’ve tried this template

template:
#Energy Monitor Dashboard - Combine Entities
  - sensor:
      - name: "Basement HVAC Template"
        unique_id: "basement_hvac_template"
        unit_of_measurement: "Wh"
        state_class: total_increasing
        device_class: energy
        state: >
          {{ states('sensor.basement_power_meter_basement_furnace_daily_energy')|float + states('sensor.basement_power_meter_basement_air_conditioner_daily_energy')|float }}

But I still can’t get the Energy dashboard to recognize the template entity
Untitled

Does anyone know what I’m doing wrong?