@Pilotbum @Chuck_Crisler
I agree with @Pilotbum Simplisafe locks almost everything down, I don’t use monitoring myself, had it about 6 months, when no call came on a false alarm, I dropped it like a hot potato. terms & conditions lol.
I can call 911 faster myself.
A hacky way to implement it is using using a smart wifi switch like a Switchbot, Switchbot Smart Switch Button Pusher (Bluetooth) – Fingerbot for Rocker Switch/One-Way Buttons, App Timer Control, No Wiring, Optional Hub Required for Voice/Remote, White: Amazon.com: Industrial & Scientific
This button pusher might press a dedicated Simplisafe Panic button or maybe even a keypad panic button, they must be held 2 seconds I think. The Switchbot is controllable in HAOS.
The downside is pressing a panic button may dispatch emergency services if you miss the call or don’t cancel via text message, $fines$ if a false alarm in some locales.
I dont think, but am uncertain since I don’t have an SS temp sensor, that if triggered it only generates calls and text, no dispatch. 
Since it’s not a human life critical, plant life perhaps, its probably best to use a good freeze/temp sensors in HAOS, send yourself notifications, turn on a siren or smart lights as desired.
I also still arm and disarm Simplisafe as a backup to Alarmo, both use via geofenceing automations to do that or timing schedules, sunrise, sunset etc.
HAOS equals open and practically anything is possible, Simplisafe equals closed and not much automation available.
Their sensors might or could be used for non critical automations, lower curtains at sunset etc.
But, since I have parallel Zigbee sensors on all my doors and windows I only automated arming and disarming SS. Zwave sensors could also be used and might be more hack resistant than Zigbee, a bit more money.
As @Pilotbum mentioned, Noonlight monitoring can be integrated with HAOS alarm systems, my choice, Alarmo. It is about $10 per month, it has no cellular backup if thats important, it is WiFi. I don’t have it, can’t vouch.
I loaded @bachya integration way back 1.5 years ago probably, he does great work.
I’ll use it as long as my Simplisafe hardware functions as backup.
Whether or what the new owner of Simplisafe, GTCR does with Simplisafe is unknown. I do know that they also own or bought two of ADTs systems and absorbed it into Everon Security.
Time will tell, I self montior, my Home Assistant has been extremely reliable, even though I play in HAOS Beta. lol
Since I’m retired, It keeps my gray matter active building automations and tweaking stuff.
The latest, whole home occupancy.