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use strict;
use warnings;
use JSON;
...
$_ = '{"temp":75.50,"tmode":2,"fmode":0,"override":0,"hold":0,"t_cool"
+:75.00,"tstate":0,"fstate":0,"time":{"day":4,"hour":13,"minute":49},"
+t_type_post":0}';

print Dumper decode_json ($_);

$VAR1 = {
          'fstate' => 0,
          't_cool' => '75',
...
          'tstate' => 0,
          't_type_post' => 0
        };

use strict;
use warnings;
use JSON;
...
    
    print "________\n";
}

Temperature: 75.5
Tmode:       2
Fmode:       0
...
minute:      49
t_type_post  0
________