Is a 3A relay enough for home heatpump and airconditioning?

Not if u use it to switch the compressor. yes if its just for the thermostat

Is it possible to connect an i2c (si7021 temp/humidity sensor) to the i2c pins 3 and 5 when using this hat?

As this board can be stacked, it has male pins on top, so you definitely physically can connect something to the pins. I guess you'll only need to take care of the I2C address you use to not interfere with the ones of the relay board(s)

Does this board have optocouplers to prevent high voltage interference?

Dont think so. I wouldn't use it for high voltage anyway. See my review

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⚡ Power up your smart home game with GeeekPi’s 4-channel relay—control, customize, conquer!

PLUG PLAY INSTALLATION - Designed for quick setup with included mounting hardware—get your smart home project live in minutes.
MULTILINGUAL PROGRAMMABLE - Supports shell access and multiple programming languages, empowering you to tailor your automation exactly how you want.
RAPID RESPONSE RELAY CHANNELS - Experience lightning-fast switching speeds that keep your automation projects running smoothly and reliably.
SEAMLESS SMART HOME INTEGRATION - Effortlessly control 4 devices with your Raspberry Pi—no programming needed or dive into code for full customization.
PRECISION ADDRESSING WITH DIP SWITCH - Avoid address conflicts by easily toggling I2C addresses, ensuring flawless multi-module setups.

The GeeekPi 4 Channel Relay Module is a compact, stackable expansion board designed for Raspberry Pi models 2, 3, and 4. Featuring four high-speed relays, DIP switch-configurable I2C addresses, and easy plug-and-play installation, it enables both no-code and programmable smart home automation with reliable multi-module support.

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Brand	GeeekPi
Package Dimensions	10.69 x 8.1 x 3.1 cm; 59 g
Manufacturer reference	EP-0099
Manufacturer	GeeekPi
Series	Raspberry Pi 4 Model B
Form Factor	Stick
Processor Brand	ARM
Processor Count	1
Memory Technology	LPDDR2, LPDDR4
Wireless Type	Infrared
Operating System	Raspberry Pi OS (ehemals Raspbian)
Are Batteries Included	No
Item Weight	59 g
Guaranteed software updates until	unknown

GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable)

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