Are there "dead" factory levels?

No. Every Titanium Alloy Factory level adds a flat ~720 Titanium/hour (≈ 720 × level) — there are no wasted levels. The returns diminish in build time , not output.

Should I stop the factories at level 15?

No. Keep all five factories roughly even and keep levelling them — the cheapest next +720/hr is always your lowest factory. Only stop when a build won't pay back before the season ends.

Does levelling the High-heat Furnace make my base much warmer?

Barely — Activation Heat rises only about +0.5° per level. The big warmth lever is Overdrive (~+6° over the "on" state). You raise the furnace's level mainly for its Power, Virus Resistance and season score.

What happens to leftover Coal and Titanium at season end?

Both convert to Profession EXP, so spend down anything banked in the final week and don't hoard into the reset.

Titanium Alloy Factory & High-heat Furnace — Best Leveling Order (Season 2)

Buildings · 2026-08-12

The One Loop That Runs Season 2

Two personal buildings drive the Polar World economy, linked by two resources:

BuildingWhat it does

Titanium Alloy Factory ×5Produces Titanium Alloy continuously. Upgraded with Coal — a higher level means more Titanium per hour. You get four (No.1–No.4) plus a fifth from the Weekly Pass (produces only while the pass is active).

High-heat FurnaceHeats your base (the thing keeping you out of the −20°C lockout) and is your biggest personal season-ranking score. Upgraded with Titanium Alloy; burns Coal to stay lit.

The flow

Coal → Factories → Titanium Alloy → Furnace → warmth + season points. Coal is the raw input (from Digging Strongholds, donations and events); Titanium Alloy is the intermediate the factories make; the Furnace is the payoff. Both buildings cap at Lv 30 and both vanish at season end — and any leftover Coal and Titanium Alloy is converted to Profession EXP, so nothing you bank is wasted (see the Profession Point Allocation guide).

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