Help on Integration with Kältebringer HVAC

Hardware
1

Hey Guys,
I have a question about the Integration of an German Brand of HVAC.
Due to it beeing Black Friday Week the Kältebringer Devices are on Sale and I wonder if they can be Integrated with HA? I didn’t find anythin online on the matter. Only that the Tuya Integration might work. Does anyone have any experience?

2

I’ve created a component for esphome. It’s flashed on the original wifi module

3

Hello Kai,

sound interesting for me, considering the same Unit for my workshop and to collect experience with this type of units and HA also. Can you give a more detailed How to, I´m new to HA and have to check if I´ll be able to reproduce this for me.
Thanks a lot!

Holger

4

@KG3RK3N

Would also have some more Information about how to flash it and if it is still reliable after all the time :blush:

5

Here is a picture from the module esp_air_DIM_tcl_8M_QIO_TLS_1.3.3

You need to remove the cable from the ac PCB because you have to power up the wifi module externaly for the flashing process.

Then I have soldered a pin header and connected a flash module like this
Then you have to connect boot pin with gnd on powering up to enable the flashing mode.
You can use the esptool flash_id command to check if the connection was successful.
If it’s working, you can use esphome flashing web tool to flash esphome

Esphome is still running since 6 months on my device

6

Thank you @KG3RK3N ! :blush:
Could you please re-upload the Image? I got an access denied…

7

This link shouldn’t expire now esp_air_DIM_tcl_8M_QIO_TLS_1.3.3

8

Hello.

You said that you solder the pins on the board, to connect the usb flasher.

Ok, but… Which pins?

The row of 6? Tx1, rx1, 3v, gnd ?

Or the 4 pins that used to go the AC?

IMG_20260219_173005_238
IMG_20260219_173005_2381771×2790 197 KB

Thank you for your help!

:blush:

9

here’s the other side :

photo_2026-02-24_11-17-46
photo_2026-02-24_11-17-46755×1280 143 KB

10

Hi, I soldered a pin Header to the 6 pin row and it was enough space in the case so you don’t need to remove it afterwards.

The data lines are RXD0/TXD0.

I powered it up with 3.3v, it was completly disconnected from the climate Board

11

thank you a lot ! i just soldered the header pin too, and i’ll give it a try!

12

it works perfectly! thank you :slight_smile:

i just feel the update is very slow - delayed on the HA screen (app or web browser). when i change the heating type, “off” - heat … or the fan speed… the AC device reacts instantly “BIIP” … it works… but the update on the HA screen needs ± 60 seconds ?

anyway it’s not a big problem… i’m happy.

thnak you again!

13

60s is the default polling intervall. You can Set update_interval on your climate component to speed up the Updates.

For example:
climate:

  • platform: kaeltebringer
    uart_id: uart_bus
    name: “A/C”
    update_interval: 10s
14

thank you!!!