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!

POWER YOUR SMART HOME ⚡ - Control up to 4 high-voltage devices seamlessly with robust 3A relays.
SCALE WITHOUT LIMITS 🧩 - Stack up to 4 modules for a massive 16-channel control hub—expand your automation empire.
PLUG PLAY SIMPLICITY 🔌 - No programming required to get started, yet fully programmable for pros who want total control.
INSTANT STATUS FEEDBACK 💡 - Built-in relay status LEDs keep you informed in real-time, so you never miss a beat.
UNIVERSAL COMPATIBILITY 🌐 - Works flawlessly with Raspberry Pi 4B/3B+/3/2B, Arduino, ESP32, and more—future-proof your projects.

The GeeekPi 4 Channel Relay Board Module is a versatile, stackable relay controller compatible with Raspberry Pi and popular microcontrollers. It supports high-current switching (3A at 250V AC/30V DC), multi-language programming, and I2C protocol with address switching, making it ideal for scalable, professional-grade smart home automation projects.

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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
Processor Brand	ARM
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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