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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⚡ Elevate your DIY smart home game with effortless power control!

LIMITLESS EXPANSION - Stack up to 4 modules to scale your automation projects up to 16 channels.
COMPACT LIGHTWEIGHT - Sleek 2.08 oz design fits perfectly into any smart home setup without bulk.
POWER YOUR SMART HOME - Control high voltage devices effortlessly with 4 robust relay channels.
MULTI LANGUAGE FRIENDLY - Supports multiple programming languages for flexible development workflows.
PLUG PLAY VERSATILITY - Works seamlessly with Raspberry Pi, Arduino, STM32, ESP32 & more—no programming required.

The GeeekPi 4 Channel Relay Board Module empowers Raspberry Pi and Arduino users to control high voltage and current devices with ease. Featuring 4 relay channels, stackable design for up to 16 channels, and broad compatibility with popular microcontrollers, it offers a fast, programmable or no-code solution ideal for scalable smart home automation projects.

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TT$458

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Trinidad and Tobagostore

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TrustScore 4.5 | 7,300+ reviews

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RAM	LPDDR3
Wireless Type	Infrared
Brand	GeeekPi
Series	4 Channel Relay Board Module
Operating System	Linux
Item Weight	2.08 ounces
Package Dimensions	4.21 x 3.19 x 1.22 inches
Number of Processors	1
Manufacturer	GeeekPi
ASIN	B07Q2P9D7K
Is Discontinued By Manufacturer	No
Date First Available	March 26, 2019

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

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