Multiple LM35 temperature sensors with summing amplifier?

Question

I have two big heatsinks with four power MOSFETs on each of them, I want to control the temperature of each heatsinks so that doesn't exceed 80℃ using two LM35 temperature sensors:

^{simulate this circuit – Schematic created using CircuitLab}

There's no MCU involved and using another op amp I'll pulldown the MOSFETs gates when the limit is reached, the error up to 1-2℃ is acceptable.

Is this a good way to combine two sensors readings using analog circuitry or is there a better approach?

Answer 1

^{simulate this circuit – Schematic created using CircuitLab}

Let we have two voltage sources connected together trough resistors, as your idea. We then place a voltmeter which shows the average voltage of both sources (2+1)/2=1.5. But there is a difference between voltage source and LM35. The V1 would sink the current, while LM35 can't sink the current.

SOLUTION:

^{simulate this circuit}