If a location has a Verified Response requirement that can be fulfilled by video, there isn’t a specific required number of cameras.
Operators would need to be able to visually identify evidence of a break in. The physical intruder, an open entry point, etc.
Reasonable coverage depends on the home, but you would want to at least cover entry points on the main level. This is easiest with indoor cameras.
is there any particular IQ Panel I should get if I don’t care about compatibility with the current system?
If you are planning to replace all sensors it wouldn’t really matter, I recommend PowerG for new sensors, but the GE319.5 Mhz version is the cheapest and gives you access to S-Line encrypted sensors too. Generally that would be the go-to.
One last thing, the sensors in my current house (Interlogix) are set off or tamper during winter time, will newer/better sensors prevent this from happening?
I’m not sure how often this happens or how many sensors it affects, but it generally shouldn’t occur. Are these sensors exposed to the elements?
Installation/orientation issues can cause problems with seasonal changes. If a sensor magnet is at the edge of the magnetic gap or misaligned a bit, slight changes in contracting or expanding materials can make it easier for false alarms.