I had some yeast shipped during that massive 100+ heat wave last summer. Two different packs. One was DOA, but the other survived with a starter.
Make a starter and you'll be ok. But my rule after the experience above, I do not order liquid yeast. Local purchase only. Dry yeast is another story.
Souring: '14 Brett C Old Ale, '15 Lambic, '14 Lambic, '14 Flemish Red, '15 Flemish Pale, '15 Oud Bruin, '15 Session Kriek
Cellar: '10 Brett B Tripel, '11 Lambic, '13 Brett C English Barleywine, '13 Quadrupel, '13 Sour Stout, '14 Brett C Bitter, '14 Spontaneously Fermented Cider, '15 Wee Heavy, '15 100% Brett B Red, '15 100% Brett L Kriek, '15 Bière de Garde